According to Eadmer of Canterbury, the reason for his visit was to negotiate the release of his brother Wulfnoth and nephew Haakon, both of whom had been hostages in Normandy since 1051.
On his deathbed, King Edward "the Confessor" bequeathed the kingdom of England to Harold.
Orderic Vitalis records, that after the death of his father, Rodbertus...filius eius succeeded as Normannorum dux et Cennomannorum princeps but that he was torpori et ignavi subjectus and never governed as he should.
He joined the contingent of Robert II Count of Flanders on the First Crusade in Sep 1096, together with Etienne Comte de Blois, after pledging the duchy of Normandy to his brother King William for 10,000 marks of silver in order to fund the expedition, declaring himself duke of Normandy .
Orderic Vitalis names Adelizam et Constantiam, Ceciliam et Adalam as the daughters of Willermus Normanni dux and his wife Mathildem Balduini ducis Flandrensium filiam, neptem..sorore Henrici regis Francorum.
The sources are contradictory regarding the name of the daughter who was betrothed to Harold, as well as the timing of her death.
Notable among these are:(Chteau de Falaise, Normandy [1027/28]-Rouen, Prior de Saint-Gervais , bur Caen, Abb de Saint-Etienne). Willelmum filium suum was born apud Falesiam Deville suggests that Guillaumes birthdate can be fixed more precisely to [mid-1027], taking into account that his father Robert occupied Falaise immediately after the death of his father Duke Richard II (), not wishing to accept the authority of his older brother Duke Richard III, but that Roberts stay was short as the two brothers were reconciled soon after, it being reasonable to suppose that Roberts relationship with Guillaumes mother occurred soon after his arrival at Falaise It appears that Edward "the Confessor" King of England acknowledged Guillaume as successor to the English throne on several occasions, maybe for the first time during his visit to England in 1051 which is recorded in the Anglo-Saxon Chronicle.
Robert of Torigny records the death in 1134 of "Robertus dux Normannorum filius Willermi regisprimogenitus" and his burial at Gloucester Guillaume of Jumiges records that Duke Guillaume and his wife Balduinum Flandri comitem...filiam regali ex genere descendente... Orderic Vitalis recounts that "when a youth who had not yet received the belt of knighthood, had gone hunting in the New Forest and whilst he was galloping in pursuit of a wild beast he had been badly crushed between a strong hazel branch and the pommel of his saddle, and mortally injured" dying soon after.
Orderic Vitalis records that King William sent Mathildem back to Normandy in light of the rebellions in England and to preserve intact provinci..Rodberto puero [referring to their eldest son], dated to 1069). Richardum..Henricum, adding that Robert succeeded to ducatum Normanni.
Guillaume of Jumiges records that Duke Guillaume and his wife Balduinum Flandri comitem...filiam regali ex genere descendente... Orderic Vitalis names Rotbertum..Ricardum, Willermum et Henricum as the sons of Willermus Normanni dux and his wife Mathildem Balduini ducis Flandrensium filiam, neptem..sorore Henrici regis Francorum After unsuccessfully aspiring to govern Normandy and Maine during the lifetime of his father, Robert rebelled in 1079 and went into exile in Flanders: Orderic Vitalis records the rebellion of Robert, son of King William I, and his departure from Normandy accompanied by Rodbertus de Bellismo et Guillelmus de Britolio, Rogerius Ricardi de Benefacta filius, Rodbertus de Molbraio et Guillelmus de Molinis, Guillelmus de Ruperia, dated to [1077/78], and their journeys during five years of exile.
Alexander papa...vicarious: Ermenfredum pontificem Sedunorum et duos canonicos cardinales, dated to 1070After taking several years to subdue the whole country, he imposed the Norman feudal structure and rule everywhere with methodical and harsh persistence.
The minute description of the country contained in the Domesday Book, completed in 1086, enabled King William to create an effective tax base .
Count Simon resigned his county in 1077, became a monk and went on pilgrimage to Rome where he died Orderic Vitalis names Adelizam et Constantiam, Ceciliam et Adalam as the daughters of Willermus Normanni dux and his wife Mathildem Balduini ducis Flandrensium filiam, neptem..sorore Henrici regis Francorum, but this appears unlikely in view of Adela's child-bearing until her husband's death in 1102.