William I of England

William I (c. 1028 – 9 September 1087), was King of England from 1066 to 1087, and as Guillaume II was Duke of Normandy from 1035 to 1087. Known alternatively as William of Normandy (Fr. Guillaume de Normandie), William the Conqueror (Fr. Guillaume le Conquérant) and William the Bastard (Fr. Guillaume le Bâtard), he was the illegitimate and only son of Robert the Magnificent, Duke of Normandy, and Herleva, the daughter of Fulbert, a tanner. Born in Falaise, Normandy, now in France, William succeeded to the throne of England by right of conquest by winning the Battle of Hastings in 1066 in what has become known as the Norman Conquest.

Children of William the Conqueror and Matilda of Flanders

Some doubt exists over how many daughters there were. This list includes some entries which are obscure.

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• Robert Curthose (c. 1054–1134), Duke of Normandy, married Sybil of Conversano, daughter of Geoffrey of Conversano
• Adeliza (or Alice) (c. 1055–?), reportedly betrothed to Harold II of England (Her existence is in some doubt.)
• Cecilia (or Cecily) (c. 1056–1126), Abbess of Holy Trinity, Caen
• William Rufus (1056–1100), King of England
• Richard (1057-c. 1081), killed by a stag in New Forest
• Adela (c. 1062–1138), married Stephen, Count of Blois
• Agatha (c. 1064–c. 1080), betrothed to (1) Harold of Wessex, (2) Alfonso VI of Castile
• Constance (c. 1066–1090), married Alan IV Fergent, Duke of Brittany; poisoned, possibly by her own servants
• Matilda (very obscure, her existence is in some doubt)
• Henry Beauclerc (1068–1135), King of England, married (1) Matilda (or Edith) of Scotland, daughter of Malcolm III, King of Scotland, (2) Adeliza of Louvain