Guillaume "Longue Épée" de Normandy Princeps Nortmannorum
- Born: Abt 891, one of the islands held by Vikings 160,174
- Marriage: Espriotae de Bretagne
- Died: 17 Dec 942, Normandy about age 51 160
 Other names for Guillaume were Guillaume "Longue-Épée" Princeps Nortmannorum 174 and William "Longsword" of Normandy.
General Notes:
~Weis' Ancestral Roots . . ., 121E:19. William, "Longsword", b. cir. 891, prob. Rouen, ca. 927 succeeded. to of Normandy, circ. 930 the Bretons rebelled, he subdued them, taking Brittany, the Channel Islands, the Contentin, and the Averanchin, killed by treacherous ambush 17 Dec 942 by servants of Theobald de Blois and Arnulf of Flanders.
~The Frankish Kingdoms under the Carolingians 751-987, London & NY, Longman, 1983, p 238:
"William Longsword, Rollos's son and successor, was the principal architect of Normandy's development. William had supported Louis IV and attempted to establish his protection over Brittany, gaining at least the Cotentin and Avranchin in 933... When in 942 William was murdered at the instigation of Count Arnulf of Frlanders , his son Richard, still a minor, succeeded him." 160
Information about this person:
• Web Reference: Guilliaume "Longue Épée" by Stewat Baldwin. 174
William's place of birth was probably not on the European mainland, but possibly in Britain, Ireland, Scandinavia, or one of the islands held by Vikings. He was killed in a treacherous ambush by Theodore of Blois and Arnulf of Flanders.
Guillaume married Espriotae de Bretagne. (Espriotae de Bretagne was born in 911 in Bretagne, France and died about 972.)
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