page_title: William the Conqueror
section_title: Consolidation of power
hierarchical_section_title: William the Conqueror / Duke of Normandy / Consolidation of power
caption_attribution_description: English: Accord of Winchester signed 1072 by William the Conqueror &amp; his wife. This elevated Canterbury over York as to whose archbishop would be the highest primate in England. The large Xs are the 'signatures' of William &amp; Matilda, the one under theirs is Lanfranc's, and the other bishops' are under his.
context_page_description: William I, usually known as William the Conqueror and sometimes William the Bastard, was the first Norman King of England, reigning from 1066 until his death in 1087. He was a descendant of Rollo and was Duke of Normandy from 1035 onward. His hold was secure on Normandy by 1060, following a long struggle to establish his throne, and he launched the Norman conquest of England six years later. The rest of his life was marked by struggles to consolidate his hold over England and his continental lands, and by difficulties with his eldest son, Robert Curthose.
  William was the son of the unmarried Robert I, Duke of Normandy, by his mistress Herleva. His illegitimate status and his youth caused some difficulties for him after he succeeded his father, as did the anarchy which plagued the first years of his rule. During his childhood and adolescence, members of the Norman aristocracy battled each other, both for control of the child duke, and for their own ends. In 1047, William was able to quash a rebellion and begin to establish his authority over the duchy, a process that was not complete until about 1060.
context_section_description: William's next efforts were against Guy of Burgundy, who retreated to his castle at Brionne, which William besieged. After a long effort, the duke succeeded in exiling Guy in 1050. To address the growing power of the Count of Anjou, Geoffrey Martel, William joined with King Henry in a campaign against him, the last known cooperation between the two. They succeeded in capturing an Angevin fortress, but accomplished little else. Geoffrey attempted to expand his authority into the county of Maine, especially after the death of Hugh IV of Maine in 1051. Central to the control of Maine were the holdings of the Bellême family, who held Bellême on the border of Maine and Normandy, as well as the fortresses at Alençon and Domfront. Bellême's overlord was the king of France, but Domfort was under the overlordship of Geoffrey Martel and Duke William was Alençon's overlord. The Bellême family, whose lands were quite strategically placed between their three different overlords, were able to play each of them against the other and secure virtual independence for themselves.
  On the death of Hugh of Maine, Geoffrey Martel occupied Maine in a move contested by William and King Henry; eventually, they succeeded in driving Geoffrey from the county, and in the process, William was able to secure the Bellême family strongholds at Alençon and Domfort for himself. He was thus able to assert his overlordship over the Bellême family and compel them to act consistently in Norman interests. But in 1052 the king and Geoffrey Martel made common cause against William at the same time as some Norman nobles began to contest William's increasing power. Henry's about-face was probably motivated by a desire to retain dominance over Normandy, which was now threatened by William's growing mastery of his duchy. William was engaged in military actions against his own nobles throughout 1053, as well as with the new Archbishop of Rouen, Mauger. In February 1054 the king and the Norman rebels launched a double invasion of the duchy. Henry led the main thrust through the county of Évreux, while the other wing, under the king's brother Odo, invaded eastern Normandy.
  William met the invasion by dividing his forces into two groups. The first, which he led, faced Henry. The second, which included some who became William's firm supporters, such as Robert, Count of Eu, Walter Giffard, Roger of Mortemer, and William de Warenne, faced the other invading force. This second force defeated the invaders at the Battle of Mortemer. In addition to ending both invasions, the battle allowed the duke's ecclesiastical supporters to depose Archbishop Mauger. Mortemer thus marked another turning point in William's growing control of the duchy, although his conflict with the French king and the Count of Anjou continued until 1060. Henry and Geoffrey led another invasion of Normandy in 1057 but were defeated by William at the Battle of Varaville. This was the last invasion of Normandy during William's lifetime. In 1058, William invaded the County of Dreux and took Tillières-sur-Avre and Thimert. Henry attempted to dislodge William, but the Siege of Thimert dragged on for two years until Henry's death. The deaths of Count Geoffrey and the king in 1060 cemented the shift in the balance of power towards William.
  One factor in William's favour was his marriage to Matilda of Flanders, the daughter of Count Baldwin V of Flanders. The union was arranged in 1049, but Pope Leo IX forbade the marriage at the Council of Rheims in October 1049. The marriage nevertheless went ahead some time in the early 1050s, possibly unsanctioned by the pope. According to a late source not generally considered to be reliable, papal sanction was not secured until 1059, but as papal-Norman relations in the 1050s were generally good, and Norman clergy were able to visit Rome in 1050 without incident, it was probably secured earlier. Papal sanction of the marriage appears to have required the founding of two monasteries in Caen – one by William and one by Matilda. The marriage was important in bolstering William's 
caption: The signatures of William I and Matilda are the first two large crosses on the Accord of Winchester from 1072.
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