Süleyman Pasha ( son of Orhan ) Süleyman Pasha ( 1316 – 1357 ) was the eldest son of Orhan I , the second bey of the newly established Ottoman Empire . Assault on Byzantium . Süleyman Pasha struck a bold blow to the weakened Byzantine Empire on behalf of his race , which gave the Turks a permanent establishment on the European side of the Hellespont . This event took place in 1354 . The Ottoman writers pass over in silence the previous incursions of the Turks into Europe , which gained no conquest and led to no definite advantage , but they dwell fully on this expedition of Süleyman , and adorn it with poetic legends of the vision that appeared to the young chieftain as he mused on the sea - shore near the ruins of Cyzicus . They tell how the crescent of the moon rose before him as the emblem of his race , and united the continents of Europe and Asia with a chain of silver light , while temples and palaces floated up out of the great deep , and mysterious voices blended with the sounding sea , exciting in his heart a yearning for predestined enterprise , and a sense of supernatural summons . The dream may have been both the effect of previous schemes , and the immediate stimulant that " made Süleyman put his scheming into act " . With only thirty - nine of his chosen warriors , he embarked at night in a Genoese bark on the Asiatic side of the Hellespont , and surprised the Castle of Tzympe ( Cinbi ) , on the opposite coast . Reinforcements soon pushed across to the adventurers , and in three days Tzympe was garrison ed by three thousand Ottoman troops . At this crisis , Cantacuzene was so severely pressed by his rival Palaeologus , that , instead of trying to dislodge the invaders from Tzympe , or even remonstrating against their occupation of that fortress , he implored the help of Orhan against his domestic enemy . Orhan gave up his brother - in - law ' s cause , and provided assistance to the old emperor . But he ordered that assistance to be administered by Süleyman , the conqueror of Tzympe , an axillary the most formidable to those with whom he was to operate . Ten thousand more Turks were sent across to Süleyman , who defeated the Slavonic forces which Palaeologus had brought to the empire , but the victors never left the continent on which they hid conquered . Cantacuzene offered Süleyman ten thousand ducats to retire from Tzympe . The sum was agreed on , but before the ransom was paid , a terrible earthquake shook the whole district of Thrace , and threw down the walls of its fenced cities . Two of Süleyman ' s captains , Adjé Bey , and Ghas Fasil , instantly occupied the important town of Gallipoli , marching in over the walls which the earthquake had shattered , meeting no resistance by the awe - struck inhabitants . The fields in the neighbourhood still are named after Adjé ; and the tombs of these two captains of the Osmanli host are yet to be seen in Gallipoli . They were buried on the scene of their great exploit . Turkish pilgrims gather there in veneration of the warriors , who gave to their race the strong city , the key of the Hellespont , the gate to easy passage into Europe . Süleyman , on hearing that his troops had occupied Gallipoli , refused to give up Tzympe . He threw large colonies of Turks and Arabs across the straits , which he planted in the territory , which had been thus acquired . The fortifications of Gallipoli were repaired , and that important post was strongly garrisoned . Süleyman took possession of other places in the Thracian Chersonese , which he strengthened with new walls and secured with detachments of his best troops . The Greek Emperor made a formal complaint of these aggressions to Orhan , who replied that it was not the force of arms that had opened the Greek cities to his son , but the will of God , manifested in the earthquake . The Emperor rejoined that the question was not how the Turks had marched into the cities , but whether they had any right to retain them . Orhan asked for time to think , and afterward made proposals for negotiating the restoration of the cities , but he had firmly resolved to take full advantage of the opportunities for expanding the Ottoman power . The Ottoman power was now the basis for operations in Europe which had been acquired , and was afforded by the perpetual dissensions that raged between Cantacuzene and his son - in - law Palaeologus – each of whom was continually soliciting Orhan ' s aid against the other , and obtaining that aid according to what seemed best for the interests of the Turkish sovereign , who was the real enemy of them both . Death . Süleyman , in whom Orhan Gazi seen grand prospects of further success for the house of Ottoman , had died before his father . An accidental fall from his horse , while he was engaged in the favourite Turkish sport of falconry , caused his death . Süleyman was not buried at Bursa , but , by Orhan ' s order , a türbe ( tomb ) was built for him in Bolayır , on the shore of the Hellespont , over which he had led his race to a second empire .