Manuel I Komnenos Manuel I Komnenos ( or Comnenus ) ( , " Manouēl I Komnēnos " ) ( 28 November 1118 – 24 September 1180 ) was a Byzantine Emperor of the 12th century who reigned over a crucial turning point in the history of Byzantium and the Mediterranean . Eager to restore his empire to its past glories as the superpower of the Mediterranean world , Manuel pursued an energetic and ambitious foreign policy . In the process he made alliances with the Pope and the resurgent west , invaded the Kingdom of Sicily , successfully handled the passage of the dangerous Second Crusade through his empire , and established a Byzantine protectorate over the Crusader states of Outremer . Facing Muslim advances in the Holy Land , he made common cause with the Kingdom of Jerusalem and participated in a combined invasion of Fatimid Egypt . Manuel reshaped the political maps of the Balkans and the eastern Mediterranean , placing the kingdoms of Hungary and Outremer under Byzantine hegemony and campaigning aggressively against his neighbours both in the west and in the east . However , towards the end of his reign Manuel ' s achievements in the east were compromised by a serious defeat at Myriokephalon , which in large part resulted from his arrogance in attacking a well - defended Seljuk position . Although the Byzantines recovered and Manuel concluded an advantageous peace with Sultan Kilij Arslan II , Myriokephalon proved to be the final , unsuccessful effort by the empire to recover the interior of Anatolia from the Turks . Called " ho Megas " ( , translated as " the Great " ) by the Greeks , Manuel is known to have inspired intense loyalty in those who served him . He also appears as the hero of a history written by his secretary , John Kinnamos , in which every virtue is attributed to him . Manuel , who was influenced by his contact with western Crusaders , enjoyed the reputation of " the most blessed emperor of Constantinople " in parts of the Latin world as well . Modern historians , however , have been less enthusiastic about him . Some of them assert that the great power he wielded was not his own personal achievement , but that of the dynasty he represented ; they also argue that , since Byzantine imperial power declined catastrophically after Manuel ' s death , it is only natural to look for the causes of this decline in his reign . Accession to the throne . Manuel Komnenos was the fourth son of John II Komnenos and Piroska of Hungary , so it seemed very unlikely that he would succeed his father . His maternal grandfather was St . Ladislaus . Having distinguished himself in his father ' s war against the Seljuk Turks , in 1143 Manuel was chosen as his successor by John , in preference to his elder surviving brother Isaac . After John died on 8 April 1143 , his son , Manuel , was acclaimed emperor by the armies . Yet his succession was by no means assured : At his father ' s deathbed in the wilds of Cilicia far from Constantinople , he recognised that it was vital he should return to the capital as soon as possible . He still had to take care of his father ' s funeral , and tradition demanded he organise the foundation of a monastery on the spot where his father died . Swiftly , he dispatched the " megas domestikos " John Axouch ahead of him , with orders to arrest his most dangerous potential rival , his brother Isaac , who was living in the Great Palace with instant access to the imperial treasure and regalia . Axouch arrived in the capital even before news of the emperor ' s death had reached it . He quickly secured the loyalty of the city , and when Manuel entered the capital in August 1143 , he was crowned by the new Patriarch , Michael Kourkouas . A few days later , with nothing more to fear as his position as emperor was now secure , Manuel ordered the release of Isaac . Then he ordered 2 golden pieces to be given to every householder in Constantinople and 200 pounds of gold ( including 200 silver pieces annually ) to be given to the Byzantine Church . The empire that Manuel inherited from his father had undergone great changes since its foundation by Constantine , eight centuries before . In the time of his predecessor Justinian I ( 527 – 565 ) , parts of the former Western Roman Empire had been recovered including Italy , Africa and part of Spain . However , the empire had diminished greatly following this , the most obvious change had occurred in the 7th century : the soldiers of Islam had taken Egypt , Palestine and much of Syria away from the empire irrevocably . They had then swept on westwards into what in the time of Constantine had been the western provinces of the Roman Empire , in North Africa and Spain . In the centuries since , the emperors had ruled over a realm that largely consisted of Asia Minor in the east , and the Balkans in the west . In the late 11th century the Byzantine Empire entered a period of marked military and political decline , which had been arrested and largely reversed by the leadership of Manuel ' s grandfather and father . Yet the empire that Manuel inherited was a polity facing formidable challenges . At the end of the 11th century , the Normans of Sicily had removed Italy from the control of the Byzantine Emperor . The Seljuk Turks had done the same with central Anatolia . And in the Levant , a new force had appeared – the Crusader states – who presented the Byzantine Empire with new challenges . Now , more than at any time during the preceding centuries , the task facing the emperor was daunting indeed . Second Crusade and Raynald of Châtillon . Prince of Antioch . The first test of Manuel ' s reign came in 1144 , when he was faced with a demand by Raymond , Prince of Antioch for the cession of Cilician territories . However , later that year the crusader County of Edessa was engulfed by the tide of a resurgent Islamic jihad under Imad ad - Din Atabeg Zengi . Raymond realized that immediate help from the west was out of the question . With his eastern flank now dangerously exposed to this new threat , there seemed little option but for him to prepare for a humiliating visit to Constantinople . Swallowing his pride , he made the journey north to ask for the protection of the Emperor . After submitting to Manuel , he was promised the support that he had requested , and his allegiance to Byzantium was secured . Expedition against Konya . In 1146 Manuel assembled his army at the military base Lopadion and set out on a punitive expedition against Masud the Sultan of Rûm , who had been repeatedly violating the frontiers of the Empire in western Anatolia and Cilicia . There was no attempt at a systematic conquest of territory , but Manuel ' s army defeated the Turks at Acroënus , before capturing and destroying the fortified town of Philomelion , removing its remaining Christian population . The Byzantine forces reached Masud ' s capital , Konya , and ravaged the area around the city , but could not assault its walls . Amongst Manuel ' s motives for mounting this razzia there included a wish to be seen in the West as actively espousing the crusading ideal ; Kinnamos also attributed to Manuel a desire to show off his martial prowess to his new bride . Whilst on this campaign Manuel received a letter from Louis VII of France announcing his intention of leading an army to the relief of the crusader states . Arrival of the Crusaders . Manuel was prevented from following up his early successes in the east , for events to the west meant that his presence was urgently required in the Balkans . In 1147 he granted a passage through his dominions to two armies of the Second Crusade under Conrad III of Germany and Louis VII of France . At this time , there were still members of the Byzantine court who remembered the passage of the First Crusade , which was a defining event in the collective memory of the age and one which had fascinated Manuel ' s aunt , Anna Komnene . Many Byzantines feared the Crusade , a view endorsed by the numerous acts of vandalism and theft practiced by the unruly armies as they marched through Byzantine territory . Byzantine troops followed the Crusaders , attempting to police their behaviour , and further troops were assembled in Constantinople , ready to defend the capital against any acts of aggression . This cautious approach was well advised , but still the numerous incidents of covert and open hostility between the Franks and the Greeks on their line of march , for which it seems both sides were to blame , nearly precipitated a conflict between Manuel and his guests . Manuel took the precaution – which his grandfather had not taken – of making repairs to the city walls , and pressed the two kings for guarantees concerning the security of his territories . Conrad ' s army was the first to enter the Byzantine territory in the summer of 1147 , and it figures more prominently in the Byzantine sources , which imply that it was the most troublesome of the two . After 1147 , however , the relations between the two leaders became friendlier . By 1148 Manuel had seen the wisdom of securing an alliance with Conrad , whose sister - in - law Bertha of Sulzbach he had earlier married ; he actually persuaded the German king to renew their alliance against Roger II of Sicily . Unfortunately for the Byzantine emperor , Conrad died in 1152 , and despite repeated attempts , Manuel could not reach an agreement with his successor , Frederick I Barbarossa . Cyprus invaded . Yet Manuel ' s attention was to be drawn to Antioch again in 1156 , when Raynald of Châtillon , the new Prince of Antioch , claimed that the Byzantine emperor had reneged on his promise to pay him a sum of money , and vowed to attack the Byzantine province of Cyprus . He arrested the governor of the island John Komnenos , who was a nephew of Manuel , and the general Michael Branas . The Latin historian William of Tyre deplored this act of war against fellow Christians , and described the atrocities committed by Raynald ' s men in considerable detail . Having ransacked the island and plundered all its wealth , Raynald ' s army mutilated the survivors before forcing them to buy back their flocks at exorbitant prices with what little they had left . Thus enriched with enough booty to make Antioch wealthy for years , the invaders boarded their ships and set sail for home . Raynald also sent some of the mutilated hostages to Constantinople as a vivid demonstration of his disobedience and his contempt for the Byzantine emperor . Manuel responded to this outrage in a characteristically energetic way . In the winter of 1158 – 59 , he marched to Cilicia at the head of a huge army ; the speed of his advance ( Manuel had hurried on ahead of the main army with 500 cavalry ) was such that he managed to surprise the Armenian Thoros of Cilicia , who had participated in the attack on Cyprus . All the towns and cities of Cilicia fell to Manuel immediately , and Thoros himself was forced to flee into the mountains at the last moment : he is said to have survived by sheltering alone under rocks on a hillside , where an old shepherd would bring him food to keep him alive . Manuel in Antioch . Meanwhile , news of the advance of the Byzantine army soon reached Antioch . Realising that he had no hope of defeating Manuel , Raynald also knew that he could not expect any help from king Baldwin III of Jerusalem . Baldwin did not approve of Raynald ' s attack on Cyprus , and in any case had already made an agreement with Manuel . Thus isolated and abandoned by his allies , Raynald decided that abject submission was his only hope . He appeared before the Emperor , dressed in a sack and with a rope tied around his neck , and begged for forgiveness . Manuel at first ignored the prostrate Raynald , chatting with his courtiers ; William of Tyre commented that this ignominious scene continued for so long that all present were " disgusted " by it . Eventually , Manuel forgave Raynald on condition that he became a vassal of the Empire , effectively surrendering the independence of Antioch to Byzantium . Peace having been restored , a grand ceremonial procession was staged on 12 April 1159 for the triumphant entry of the Byzantine army into the city , with Manuel riding through the streets on horseback while the Prince of Antioch and the King of Jerusalem followed on foot . Manuel dispensed justice to the citizens , and presided over games and tournaments for the crowd . In May at the head of a united Christian army he started on the road to Edessa , but he abandoned the campaign , when he secured the release by Nur ad - Din , the ruler of Syria , of 6 , 000 Christian prisoners captured in various battles since the second Crusade . Despite the glorious end of the expedition , it is argued by modern scholars that Manuel finally achieved much less than he hoped in terms of imperial restoration . Satisfied with his efforts thus far , Manuel headed back to Constantinople . On their way back , his troops were surprised in line of march by the Turks . Despite this , they won a complete victory , routing the enemy army from the field and inflicting heavy losses . In the following year he drove the Turks out of Isauria . Italian campaign . Roger II of Sicily . In 1147 Manuel was faced with war by Roger II of Sicily , whose fleet had captured the Byzantine island of Corfu and plundered Thebes and Corinth . However , despite being distracted by a Cuman attack in the Balkans , in 1148 Manuel enlisted the alliance of Conrad III of Germany , and the help of the Venetians , who quickly defeated Roger with their powerful fleet . In 1149 , Manuel recovered Corfu and prepared to take the offensive against the Normans , while Roger II sent George of Antioch with a fleet of 40 ships to pillage Constantinople ' s suburbs . Manuel had already agreed with Conrad on a joint invasion and partition of southern Italy and Sicily . The renewal of the German alliance remained the principal orientation of Manuel ' s foreign policy for the rest of his reign , despite the gradual divergence of interests between the two empires after Conrad ' s death . The death of Roger in February 1154 , who was succeeded by William I , combined with the widespread rebellions against the rule of the new King in Sicily and Apulia , the presence of Apulian refugees at the Byzantian court , and Frederick Barbarossa ' s ( Conrad ' s successor ) failure to deal with the Normans encouraged Manuel to take advantage of the multiple instabilities that existed in the Italian peninsula . He sent Michael Palaiologos and John Doukas , both of whom held the high imperial rank of " sebastos " , with Byzantine troops , 10 Byzantine ships , and large quantities of gold to invade Apulia ( 1155 ) . The two generals were instructed to enlist the support of Frederick Barbarossa , since he was hostile to the Normans of Sicily and was south of the Alps at the time , but he declined because his demoralised army longed to get back north of the Alps as soon as possible . Nevertheless , with the help of disaffected local barons including Count Robert of Loritello , Manuel ' s expedition achieved astonishingly rapid progress as the whole of southern Italy rose up in rebellion against the Sicilian Crown , and the untried William I . There followed a string of spectacular successes as numerous strongholds yielded either to force or the lure of gold . Papal - Byzantine alliance . The city of Bari , which had been the capital of the Byzantine Catapanate of Southern Italy for centuries before the arrival of the Normans , opened its gates to the Emperor ' s army , and the overjoyed citizens tore down the Norman citadel . After the fall of Bari , the cities of Trani , Giovinazzo , Andria , Taranto , and Brindisi were also captured , and William who arrived with his army ( which included 2 , 000 knights ) was heavily defeated . Encouraged by the success , Manuel dreamed of restoration of the Roman Empire at cost of union between Orthodox and Catholic Church , a prospect which would frequently be offered to the Pope during negotiations and plans for alliance . If there was ever a chance of reuniting the eastern and western churches , and coming to reconciliation with the Pope permanently , this was probably the most favourable moment . The Papacy was never on good terms with the Normans , except when under duress by the threat of direct military action . Having the " civilised " Eastern Roman Empire on its southern border was infinitely preferable to the Papacy than having to constantly deal with the troublesome Normans of Sicily . It was in Pope Hadrian IV ' s interests to reach a deal if at all possible , since doing so would greatly increase his own influence over the entire Orthodox Christian population . Manuel offered a large sum of money to the Pope for the provision of troops , with the request that the Pope grant the Byzantine emperor lordship of three maritime cities in return for assistance in expelling William from Sicily . Manuel also promised to pay 5 , 000 pounds of gold to the Pope and the Curia . Negotiations were hurriedly carried out , and an alliance was formed between Manuel and Hadrian . It was at this point , just as the war seemed decided in Manuel ' s favour , that things started to go wrong for him . The Byzantine commander Michael Palaiologos had alienated Byzantium ' s allies by his attitude , and this had stalled the campaign as Count Robert III of Loritello refused to speak to him . Although the two were reconciled , the campaign had lost some of its momentum : Michael was soon recalled to Constantinople , and his loss was a major blow to the campaign . The turning point was the Battle for Brindisi , where the Sicilians launched a major counterattack by both land and sea . At the approach of the enemy , the mercenaries that had been hired with Manuel ' s gold demanded huge rises in their pay . When this was refused , they deserted . Even the local barons started to melt away , and soon John Doukas was left hopelessly outnumbered . The arrival of Alexios Komnenos Bryennios with some ships did not retrieve the Byzantine situation in any respect . The naval battle was decided in the Sicilians ' favour , while John Doukas and Alexios Bryennios ( along with 4 Byzantine ships ) were captured . Manuel then sent Alexios Axouch to Ancona to raise another army , but , by this time , William had already retaken all of the Byzantine conquests in Apulia . The defeat at Brindisi put an end to the restored Byzantine reign in Italy ; in 1158 the Byzantine army left Italy , and never saw it again . Both Nicetas Choniates and Kinnamos , the major Byzantine historians of this period , agree , however , that the peace terms Axouch secured from William allowed Manuel to extricate himself from the war with dignity , despite a devastating raid by a Sicilian fleet of 164 ships ( carrying 10 , 000 men ) on Euboea and Almira in 1156 . Failure of the Church union . During the Italian campaign , and , afterwards , during the struggle of the Papal Curia with Frederick , Manuel tried to seduce the Popes by hints of a possible union between the Eastern and Western Churches . Although in 1155 Pope Hadrian had expressed his eagerness to prompt the reunion of the Catholic and Orthodox Churches , hopes for a lasting Papal - Byzantine alliance came up against insuperable problems . Pope Adrian IV and his successors demanded recognition of their religious authority over all Christians everywhere , and wished themselves to reach superiority over the Byzantine Emperor ; they were not at all willing to fall into a state of dependence from one emperor to the other . Manuel , on the other side , wanted an official recognition of his secular authority on both East and West . Such conditions would not be accepted by either side . Even if a pro - western Emperor such as Manuel agreed to it , the Greek citizens of the Empire would have rejected outright any union of this sort , as they did almost three hundred years later when the Orthodox and Catholic churches were briefly united under the Pope . In spite of his friendliness towards the Roman Church and his cordial relations with all the Popes , Manuel was never honoured with the title of " Augustus " by the Popes . And although he sent twice ( in 1167 and 1169 ) an embassy to Pope Alexander III offering to reunite the Greek and Latin churches , the latter refused , under pretext of the troubles that would follow that union . Ultimately , a deal proved elusive , and the two churches have remained divided . The final results of the Italian campaign were limited in terms of the advantages gained by the Empire . The city of Ancona became a Byzantine base in Italy , accepting the Emperor as sovereign . The Normans of Sicily had been damaged , and now came to terms with the Empire , ensuring peace for the rest of Manuel ' s reign . The Empire ' s ability to get involved in Italian affairs had been demonstrated . However , given the enormous quantities of gold which had been lavished on the project , it also demonstrated the limits of what money and diplomacy alone could achieve . The expense of Manuel ' s involvement in Italy must have cost the treasury a great deal ( probably more than 2 , 160 , 000 " hyperpyra " or 30 , 000 pounds of gold ) , and yet it produced only limited solid gains . Byzantine policy in Italy after 1158 . After 1158 and under the new conditions , the aims of the Byzantine policy changed . Now Manuel decided to oppose the tendency of the Hohenstaufen dynasty to annex Italy , which Frederick believed should acknowledge his power . When the war between Frederick and the north Italian cities started , Manuel actively supported the Lombard League with money subsidies . The walls of Milan , demolished by the Germans , were restored by the aid of the Byzantine Emperor . Frederick ' s defeat at the Battle of Legnano , on 29 May 1176 seemed rather to improve Manuel ' s position in Italy . According to Kinnamos , Cremona , Pavia , and a number of other " Ligurian " cities went over to Manuel ; his relations were also particularly favourable in regard to Genoa , Pisa , but not in regard to Venice . In March 1171 Manuel had suddenly broken with Venice , ordering all 20 , 000 Venetians on imperial territory to be arrested and their property confiscated . Venice , incensed , sent a fleet of 120 ships against Byzantium , which , owing to an epidemic and being pursued by 150 Byzantine ships , was forced to return without great success . In all probability , friendly relations between Byzantium and Venice were not restored in Manuel ' s lifetime . Balkan frontier . On his northern frontier Manuel expended considerable effort to preserve the conquests made by Basil II over one hundred years earlier and maintained , sometimes tenuously , ever since . Due to distraction from his neighbours on the Balkan frontier , Manuel was kept from his main objective , the subjugation of the Normans of Sicily . Relations had been good with the Serbs and Hungarians since 1129 , so the Serb rebellion came as a shock . The Serbs of Rascia , being so induced by Roger II of Sicily , invaded Byzantine territory in 1149 . Manuel forced the rebellious Serbs , and their leader , Uroš II , to vassalage ( 1150 – 1152 ) . He then made repeated attacks upon the Hungarians with a view to annexing their territory along the Sava . In the wars of 1151 – 1153 and 1163 – 1168 Manuel led his troops into Hungary and a spectacular raid deep into enemy territory yielded substantial war booty . In 1167 , Manuel sent 15 , 000 men under the command of Andronikos Kontostephanos against the Hungarians . Kontostephanos scored a decisive victory at the Battle of Sirmium which enabled the Byzantine Empire to conclude a very advantageous peace with the Hungarian Kingdom by which Syrmia , Bosnia , and Dalmatia were ceded . By 1168 nearly the whole of the eastern Adriatic coast lay in Manuel ' s hands . Efforts were also made towards a diplomatic annexation of Hungary . The Hungarian heir Béla , younger brother of the Hungarian king Stephen III , was sent to Constantinople to be educated in the court of Manuel , who intended the youth to marry his daughter , Maria , and to make him his heir , thus securing the union of Hungary with the Empire . In the court Béla assumed the name Alexius and received the title of " Despot " which had previously been applied only to the Emperor himself . However , two unforeseen dynastic events drastically altered the situation . In 1169 , Manuel ' s young wife gave birth to a son , thus depriving Béla of his status as heir of the Byzantine throne ( although Manuel would not renounce the Croatian lands he had taken from Hungary ) . Then , in 1172 , Stephen died childless , and Béla went home to take his throne . Before leaving Constantinople , he swore a solemn oath to Manuel that he would always " keep in mind the interests of the emperor and of the Romans " . Béla III kept his word : as long as Manuel lived , he made no attempt to retrieve his Croatian inheritance , which he only afterwards reincorporated into Hungary . Relations with Russia . Manuel Komnenos attempted to draw the Russian principalities into his net of diplomacy directed against Hungary , and to a lesser extent Norman Sicily . This polarised the Russian princes into pro - and anti - Byzantine camps . In the late 1140s three princes were competing for primacy in Russia : prince Iziaslav II of Kiev was related to Géza II of Hungary and was hostile to Byzantium ; Prince Yuri Dolgoruki of Suzdal was Manuel ' s ally ( " symmachos " ) , and Vladimirko of Galicia is described as Manuel ' s vassal ( " hypospondos " ) . Galicia was situated on the northern and northeastern borders of Hungary and , therefore , was of great strategic importance in the Byzantine - Hungarian conflicts . Following the deaths of both Iziaslav and Vladimirko , the situation became reversed , when Yuri of Suzdal , Manuel ' s ally , took over Kiev and Yaroslav , the new ruler of Galicia , adopted a pro - Hungarian stance . In 1164 - 5 Manuel ' s cousin Andronikos , the future emperor , escaped from captivity in Byzantium , and fled to the court of Yaroslav in Galicia . This situation , holding out the alarming prospect of Andronikos making a bid for Manuel ' s throne sponsored by both Galicia and Hungary , spurred the Byzantines into an unprecedented flurry of diplomacy . Manuel pardoned Andronikos and persuaded him to return to Constantinople ( 1165 ) . A mission to Kiev , then ruled by Prince Rostislav , resulted in a favourable treaty and a pledge to supply the Empire with auxiliary troops ; Yaroslav of Galicia was also persuaded to renounce his Hungarian connections and return fully into the imperial fold . As late as the year 1200 the princes of Galicia were providing invaluable services against the Empire ' s , at this time Cuman , enemies . The restoration of relations with Galicia had an immediate benefit for Manuel when , in 1166 , he dispatched two armies to attack the eastern provinces of Hungary in a vast pincer movement . One army crossed the Walachian Plain and entered Hungary through the Transylvanian Alps ( Southern Carpathians ) , whilst the other army made a wide circuit to Galicia and , with Galician aid , crossed the Carpathian Mountains . Since the Hungarians had most of their forces concentrated on the Sirmium and Belgrade frontier they were caught off guard by the Byzantine invasion and the Hungarian province of Transylvania was thoroughly ravaged by the Byzantine armies . Invasion of Egypt . Alliance with the Kingdom of Jerusalem . Control of Egypt was a decades - old dream of the crusader Kingdom of Jerusalem , and king Amalric I of Jerusalem needed all the military and financial support he could get for his policy of military intervention in Egypt . Amalric also realised that if he were to pursue his ambitions in Egypt , he might have to leave Antioch to the hegemony of Manuel who had paid 100 , 000 dinars for the release of Bohemond III . In 1165 , he sent envoys to the Byzantine court to negotiate a marriage alliance ( Manuel had already married Amalric ' s cousin Maria of Antioch in 1161 ) . After a long interval of two years , Amalric married Manuel ' s grandniece Maria Komnene in 1167 , and " swore all that his brother Baldwin had sworn before . " A formal alliance was negotiated in 1168 , whereby the two rulers arranged for a conquest and partition of Egypt , with Manuel taking the coastal area , and Amalric the interior . In the autumn of 1169 Manuel sent a joint expedition with Amalric to Egypt : a Byzantine army and a naval force of 20 large warships , 150 galleys , and 60 transports , under the command of the " megas doux " Andronikos Kontostephanos joined forces with Amalric at Ascalon . William of Tyre , who negotiated the alliance , was impressed in particular by the large transport ships which were used to transport the cavalry forces of the army . Although such a long range attack on a state far from the centre of the Empire may seem extraordinary ( the last time the Empire had attempted anything on this scale was the failed invasion of Sicily over one hundred and twenty years earlier ) , it can be explained in terms of Manuel ' s foreign policy , which was to use the Latins to ensure the survival of the Empire . This focus on the bigger picture of the eastern Mediterranean and even further afield thus led Manuel to intervene in Egypt : it was believed that in the context of the wider struggle between the crusader states and the Islamic powers of the east , control of Egypt would be the deciding factor . It had been becoming clear that the ailing Fatimid Caliphate of Egypt held the key to the fate of the crusader states . If Egypt came out of its isolation , and joined forces with the Muslims under Nur ad - Din , the crusader cause was in trouble . A successful invasion of Egypt would have several further advantages for the Byzantine Empire . Egypt was a rich province , and in the days of the Roman Empire had supplied much of the grain for Constantinople before it was lost to the Arabs in the 7th century . The revenues that the Empire could have expected to gain from the conquest of Egypt would have been considerable , even if these would have to be shared with the Crusaders . Furthermore , Manuel may have wanted to encourage Amalric ' s plans , not only in order to deflect Latins ' ambitions away from Antioch , but also in order to create new opportunities for joint military ventures that would keep the King of Jerusalem in his debt , and also allow the Empire to share in territorial gains . Failure of the expedition . The joined forces of Manuel and Amalric laid siege to Damietta on 27 October 1169 , but the siege was unsuccessful due to the failure of the Crusaders and the Byzantines to co - operate fully . According to Byzantine forces , Amalric , not wanting to share the profits of victory , dragged out the operation until the emperor ' s men ran short of provisions and were particularly affected by famine ; Amalric then launched an assault , which he promptly aborted by negotiating a truce with the defenders . On the other hand , William of Tyre remarked that the Greeks were not entirely blameless . Whatever the truth of the allegations of both sides , when the rains came , both the Latin army and the Byzantine fleet returned home , although half of the Byzantine fleet was lost in a sudden storm . Despite the bad feelings generated at Damietta , Amalric still refused to abandon his dream of conquering Egypt , and he continued to seek good relations with the Byzantines in the hopes of another joined attack , which never took place . In 1171 Amalric came to Constantinople in person , after Egypt had fallen to Saladin . Manuel was thus able to organise a grand ceremonial reception which both honoured Amalric , and underlined his dependence : for the rest of Amalric ' s reign , Jerusalem was a Byzantine satellite , and Manuel was able to act as a protector of the Holy Places , exerting a growing influence in the Kingdom of Jerusalem . In 1177 , a fleet of 150 ships was sent by Manuel I to invade Egypt , but returned home after appearing off Acre due to the refusal of Count Philip of Flanders and many important nobles of the Kingdom of Jerusalem to help . Kilij Arslan II and the Seljuk Turks . Between 1158 – 1161 , a series of Byzantine campaigns against the Seljuk Turks of the Sultanate of Rûm resulted in a treaty favourable to the Empire . According to the agreement certain frontier regions , including the city of Sivas , should be handed over to Manuel in return for some quantity of cash . However , when it became clear that the Seljuks had no intention of honouring their side of the bargain , Manuel decided that it was time to deal with the Turks once and for all . Therefore , he assembled the full imperial army , and marched against the Seljuk capital , Iconium ( Konya ) . Manuel ' s strategy was to prepare the advanced bases of Dorylaeum and Sublaeum , and then to use them as to strike as quickly as possible at Iconium . Yet Manuel ' s army of 35 , 000 men was large and unwieldy – according to a letter which Manuel sent to King Henry II of England , the advancing column was ten miles ( 16 km ) long . Manuel marched against Iconium via Laodicea , Chonae , Lampe , Celaenae , Choma and Antioch . Just outside the entrance to the pass at Myriokephalon , Manuel was met by Turkish ambassadors , who offered peace on generous terms . Most of Manuel ' s generals and experienced courtiers urged him to accept the offer . However , the younger and more aggressive members of the court urged Manuel to attack ; he took their advice and continued his advance . Manuel made serious tactical errors , such as failing to properly scout out the route ahead . These failings caused him to lead his forces straight into a classic ambush . On 17 September 1176 Manuel was decisively defeated by Kilij Arslan II at the Battle of Myriokephalon ( in highlands near the Tzibritze pass ) , in which his army was ambushed while marching through the narrow mountain pass . The Byzantines were too dispersed , and were surrounded . The army ' s siege equipment was quickly destroyed , and Manuel was forced to withdraw – without siege engine s , the conquest of Iconium was impossible . According to Byzantine sources , Manuel lost his nerve both during and after the battle , fluctuating between extremes of self - delusion and self - abasement ; according to William of Tyre , he was never the same again . The terms by which Seljuk Sultan Kilij Arslan II allowed Manuel and his army to leave were that he should remove his forts and armies on the frontier at Dorylaeum and Sublaeum . However since the Sultan had already failed to keep his side of the earlier treaty of 1162 , Manuel only ordered the fortifications of Sublaeum to be dismantled , but not the fortifications of Dorylaeum . Nevertheless , defeat at Myriokephalon was an embarrassment for both Manuel personally and also for his empire . The Komnenian emperors had worked hard since the Battle of Manzikert , 105 years earlier , to restore the reputation of the empire . Yet because of his over - confidence , Manuel had demonstrated to the whole world that Byzantium still could not defeat the Seljuks , despite the advances made during the past century . In western opinion , Myriokephalon cut Manuel down to a humbler size : not that of Emperor of the Romans but that of King of the Greeks . The defeat at Myriokephalon has often been depicted as a catastrophe in which the entire Byzantine army was destroyed . Manuel himself compared the defeat to Manzikert ; it seemed to him that the Byzantine defeat at Myriokephalon complemented the destruction at Manzikert . In reality , although a defeat , it was not too costly , and did not significantly ruin the Byzantine army . Most of the casualties were borne by the right wing , largely composed of allied troops commanded by Baldwin of Antioch , and also the baggage train , which was the main target of the Turkish ambush . The limited losses inflicted on native Byzantine troops were quickly made good and in the following year Manuel ' s forces defeated a force of " picked Turks " . John Komnenos Vatatzes , who was sent by the Emperor to repel the Turkish invasion , not only brought troops from the capital but also was able to gather an army along the way which allowed him to score a victory over the Turks at the Battle of Hyelion and Leimocheir ; a sign that the Byzantine army remained strong and that the defensive program of western Asia Minor was still successful . After the victory on the Meander , Manuel himself advanced with a small army to drive the Turks from Panasium , south of Cotyaeum . However , in 1178 a Byzantine army retreated after encountering a Turkish force at Charax , allowing the Turks to capture many livestock . The city of Claudiopolis in Bithynia was besieged by the Turks in 1179 , forcing Manuel to lead a small cavalry force to save the city and then , even as late as 1180 , the Byzantines succeeded in scoring a victory over the Turks . However , the continuous warfare did have a serious effect upon Manuel ' s vitality ; he declined in health and in 1180 succumbed to a slow fever . Furthermore , like Manzikert , the balance between the two powers began to gradually shift – Manuel never again attacked the Turks and , after his death , they began to move further and further west , deeper into Byzantine territory . Doctrinal controversies ( 1156 – 1180 ) . During Manuel ' s reign three major theological controversies occurred . In 1156 – 1157 the question was raised , whether Christ had offered himself as a sacrifice for the sins of the world to the Father and to the Holy Spirit only , or also to the Logos ( i . e . , to himself ) . In the end a synod held at Constantinople in 1157 adopted a compromise formula , that the Word made flesh offered a double sacrifice to the Holy Trinity , despite the dissidence of Patriarch of Antioch - elect Soterichus Panteugenus . Ten years later , a controversy arose as to whether the saying of Christ , " My Father is greater than I " referred to his divine nature , to his human , or the union of these two natures . Demetrius of Lampe , a Byzantine diplomat recently returned from the West , ridiculed the way the verse was interpreted there , that Christ was inferior to his father in his humanity , but equal in his divinity . Manuel on the other hand , perhaps with an eye on the project for Church union , found that the formula made sense , and prevailed over a majority in a synod convened on 2 March 1166 to decide the issue , where he had the support of the patriarch Luke Chrysoberges and later Patriarch Michael III . Those who refused to submit to the synod ' s decisions had their property confiscated or were exiled . The political dimensions of this controversy are apparent from the fact that a leading dissenter from the Emperor ' s doctrine was his nephew Alexios Kontostephanos . A third controversy sprung up in 1180 , when Manuel objected to the formula of solemn abjuration , which was exacted from Muslim converts . One of the more striking anathema s of this abjuration was that directed against the deity worshipped by Muhammad and his followers : The emperor ordered the deletion of this anathema from the Church ' s catechetical texts , a measure that provoked vehement opposition from both the Patriarch and bishops . Chivalric narrations . Manuel is representative of a new kind of Byzantine ruler who was influenced by his contact with western Crusaders . He arranged jousting matches , even participating in them , an unusual and discomforting sight for the Byzantines . Endowed with a fine physique , Manuel has been the subject of exaggeration in the Byzantine sources of his era , where he is presented as a man of great personal courage . According to the story of his exploits , which appear as a model or a copy of the romances of chivalry , such was his strength and exercise in arms , that Raymond of Antioch was incapable of wielding his lance and buckler . In a famous tournament , he is said to have entered the lists on a fiery courser , and to have overturned two of the stoutest Italian knights . In one day , he is said to have slain forty Turks with his own hand , and in a battle against the Hungarians he allegedly snatched a banner , and was the first , almost alone , who passed a bridge that separated his army from the enemy . On another occasion , he is said to have cut his way through a squadron of five hundred Turks , without receiving a wound ; he had previously posted an ambuscade in a wood , and was accompanied only by his brother and Axouch . Family . Manuel had two wives . His first marriage , in 1146 , was to Bertha of Sulzbach , a sister - in - law of Conrad III of Germany . She died in 1159 . Children : Manuel ' s second marriage was to Maria of Antioch ( nicknamed " Xene " ) , a daughter of Raymond and Constance of Antioch , in 1161 . By this marriage , Manuel had one son : Manuel had several illegitimate children : By Theodora Vatatzina : By Maria Taronitissa , the wife of " protovestiarios " John Komnenos , whose legitimate children included Maria Komnene , Queen consort of Jerusalem : By other lovers : Assessments . Foreign and military affairs . As a young man , Manuel had been determined to restore by force of arms the predominance of the Byzantine Empire in the Mediterranean countries . By the time he died in 1180 , 37 years had passed since that momentous day in 1143 when , amid the wilds of Cilicia , his father had proclaimed him emperor . These years had seen Manuel involved in conflict with his neighbours on all sides . Manuel ' s father and grandfather before him had worked patiently to undo the damage done by the battle of Manzikert and its aftermath . Thanks to their efforts , the empire Manuel inherited was stronger and better organised than at any time for a century . While it is clear that Manuel used these assets to the full , it is not so clear how much he added to them , and there is room for doubt as to whether he used them to best effect . Manuel had proven himself to be an energetic emperor who saw possibilities everywhere , and whose optimistic outlook had shaped his approach to foreign policy . However , in spite of his military prowess Manuel achieved but in a slight degree his object of restoring the Byzantine Empire . Retrospectively , some commentators have criticised some of Manuel ' s aims as unrealistic , in particular citing the expeditions he sent to Egypt as proof of dreams of grandeur on an unattainable scale . His greatest military campaign , his grand expedition against the Turkish Sultanate of Iconium , ended in humiliating defeat , and his greatest diplomatic effort apparently collapsed , when Pope Alexander III became reconciled to the German emperor Frederick Barbarossa at the Peace of Venice . Historian Mark C . Bartusis argues that Manuel ( and his father as well ) tried to rebuild a national army , but his reforms were adequate for neither his ambitions nor his needs ; the defeat at Myriokephalon underscored the fundamental weakness of his policies . According to Edward Gibbon , Manuel ' s victories were not productive of any permanent or useful conquest . His advisors on western church affairs included the Pisan scholar Hugh Eteriano . Internal affairs . Choniates criticised Manuel for raising taxes and pointed to Manuel ' s reign as a period of excession ; according to Choniates , the money thus raised was spent lavishly at the cost of his citizens . Whether one reads the Greek encomiastic sources , or the Latin and oriental sources , the impression is consistent with Choniates ' picture of an emperor who spent lavishly in all available ways , rarely economising in one sector in order to develop another . Manuel spared no expense on the army , the navy , diplomacy , ceremonial , palace - building , the Komnenian family , and other seekers of patronage . A significant amount of this expenditure was pure financial loss to the Empire , like the subsidies poured into Italy and the crusader states , and the sums spent on the failed expeditions of 1155 – 1156 , 1169 , and 1176 . The problems this created were counterbalanced to some extent by his successes , particularly in the Balkans ; Manuel extended the frontiers of his Empire in the Balkan region , ensuring security for the whole of Greece and Bulgaria . Had he been more successful in all his ventures , he would have controlled not only the most productive farmland around the Eastern Mediterranean and Adriatic seas , but also the entire trading facilities of the area . Even if he did not achieve his ambitious goals , his wars against Hungary brought him control of the Dalmatian coast , the rich agricultural region of Sirmium , and the Danube trade route from Hungary to the Black Sea . His Balkan expeditions are said to have taken great booty in slaves and livestock ; Kinnamos was impressed by the amount of arms taken from the Hungarian dead after the battle of 1167 . And even if Manuel ' s wars against the Turks probably realised a net loss , his commanders took livestock and captives on at least two occasions . This allowed the Western provinces to flourish in an economic revival which had begun in the time of his grandfather Alexios I , and which continued till the close of the century . Indeed it has been argued that Byzantium in the 12th century was richer and more prosperous than at any time since the Persian invasion during the reign of Herakleios , some five hundred years earlier . There is good evidence from this period of new construction , and new churches even in remote areas strongly suggest that wealth was widespread . Trade was also flourishing ; it has been estimated that the population of Constantinople , the biggest commercial center of the Empire , during Manuel ' s reign was between half a million and one million , making it by far the largest city in Europe . A major source of Manuel ' s wealth was the " kommerkion " , a customs duty levied at Constantinople on all imports and exports . The " kommerkion " was stated to have collected 20 , 000 " hyperpyra " each day . Furthermore , the Byzantine capital was a city undergoing expansion . The cosmopolitan character of Constantinople was being reinforced by the arrival of Italian merchants and Crusaders en route to the Holy Land . The Venetians , the Genoese and others opened up the ports of the Aegean to commerce , shipping goods from the Crusader kingdoms of Outremer and Fatimid Egypt to the west and trading with Byzantium via Constantinople . These maritime traders stimulated demand in the towns and cities of Greece , Macedonia and the Greek Islands , generating new sources of wealth in a predominantly agrarian economy . Thessaloniki , the second city of the Empire , hosted a famous summer fair which attracted traders from across the Balkans and even further afield to its bustling market stalls . In Corinth , silk production fuelled a thriving economy . All this is a testament to the success of the Komnenian Emperors in securing a " Pax Byzantina " in these heartland territories . Legacy . To the rhetor s of his court , Manuel was the " divine emperor " . A generation after his death , Choniates referred to him as " the most blessed among emperors " , and a century later John Stavrakios described him as " great in fine deeds " . John Phokas , a soldier who fought in Manuel ' s army , characterised him some years later as the " world saving " and glorious emperor . Manuel would be remembered in France , Italy and the Crusader states as the most powerful sovereign in the world . A Genoese analyst noted that with the passing of " Lord Manuel of divine memory , the most blessed emperor of Constantinople . . . all Christendom incurred great ruin and detriment . " William of Tyre called Manuel " a wise and discreet prince of great magnificence , worthy of praise in every respect " , " a great - souled man of incomparable energy " , whose " memory will ever be held in benediction . " Manuel was further extolled by Robert of Clari as a " a right worthy man , [ . . . ] and richest of all the Christians who ever were , and the most bountiful . " A telling reminder of the influence that Manuel held in the Crusader states in particular can still be seen in the church of the Holy Nativity in Bethlehem . In the 1160s the nave was redecorated with mosaics showing the councils of the church . Manuel was one of the patrons of the work . On the south wall , an inscription in Greek reads : " the present work was finished by Ephraim the monk , painter and mosaicist , in the reign of the great emperor Manuel Porphyrogennetos Komnenos and in the time of the great king of Jerusalem , Amalric . " That Manuel ' s name was placed first was a symbolic , public recognition of Manuel ' s overlordship as leader of the Christian world . Manuel ' s role as protector of the Orthodox Christians and Christian holy places in general is also evident in his successful attempts to secure rights over the Holy Land . Manuel participated in the building and decorating of many of the basilicas and Greek monasteries in the Holy Land , including the church of the Holy Sepulchre in Jerusalem , where thanks to his efforts the Byzantine clergy were allowed to perform the Greek liturgy each day . All this reinforced his position as overlord of the Crusader states , with his hegemony over Antioch and Jerusalem secured by agreement with Raynald , Prince of Antioch , and Amalric , King of Jerusalem respectively . Manuel was also the last Byzantine emperor who , thanks to his military and diplomatic success in the Balkans , could call himself " ruler of Dalmatia , Bosnia , Croatia , Serbia , Bulgaria and Hungary " . Byzantium looked impressive , when Manuel died in 1180 , having just celebrated the betrothal of his son Alexios II to the daughter of the king of France . Thanks to the diplomacy and campaigning of Alexios , John , and Manuel , the empire was a great power , economically prosperous , and secure on its frontiers ; but there were serious problems as well . Internally , the Byzantine court required a strong leader to hold it together , and after Manuel ' s death stability was seriously endangered from within . Some of the foreign enemies of the Empire were lurking on the flanks , waiting for a chance to attack , in particular the Turks in Anatolia , whom Manuel had ultimately failed to defeat , and the Normans in Sicily , who had already tried but failed to invade the Empire on several occasions . Even the Venetians , the single most important western ally of Byzantium , were on bad terms with the empire at Manuel ' s death in 1180 . Given this situation , it would have taken a strong Emperor to secure the Empire against the foreign threats it now faced , and to rebuild the depleted Imperial Treasury . But Manuel ' s son was a minor , and his unpopular regency government was overthrown in a violent " coup d ' état " . This troubled succession weakened the dynastic continuity and solidarity on which the strength of the Byzantine state had come to rely .