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William I[a] (c. 1028[1] – 9 September 1087), usually known as William the Conqueror and sometimes William the Bastard,[2][b] 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.
a. Old Norman: Williame I; Old English: Willelm I
b. He was regularly described as bastardus (bastard) in non-Norman contemporary sources.[2]
d. The exact date of William's birth is confused by contradictory statements by the Norman chroniclers. Orderic Vitalis has William on his deathbed claim that he was 64 years old, which would place his birth around 1023. But elsewhere, Orderic states that William was 8 years old when his father left for Jerusalem in 1035, placing the year of birth in 1027. William of Malmesbury gives an age of 7 for William when his father left, giving 1028. Another source, De obitu Willelmi, states that William was 59 years old when he died in 1087, allowing for either 1028 or 1029.[9]
1. Bates William the Conqueror p. 33
2. Bates "William I" Oxford Dictionary of National Biography

Issue:
Robert II, Duke of Normandy
Richard of Normandy
Adeliza
Cecilia
William II, King of England
Constance, Duchess of Brittany
Adela, Countess of Blois
Henry I, King of England
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Line 121
24. WILLIAM I, the Conqueror (natural son by Herleve), b. Falaise, 1027, d. Rouen, 9 Sept. 1087, Duke of Normandy, King of England 1066-1087; m. 1053, MAUD (or MATILDA ) OF FLANDERS (162-23), b. 1032, d. 3 Nov. 1083. (CCN, 494; Moriarty; Es II/81).

Matilda, or Maud, was the daughter of Baldwin V, Count of Flanders, and Adela, herself daughter of King Robert II of France.[1]