Guillaume I "Longsword," Duke of Normandy

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Guillaume I "Longsword," Duke of Normandy, son of Rollo "of Normandy," Princeps Nortmannorum (leader of the Normans [of Rouen]) and Poppa, was born not on continental Europe, but some other place where the son of a Viking might be born, such as Britain, Ireland, Scandinavia, or an island held by the Vikings (Orkneys, Hebrides, Man, etc.)1,2 He died at Picquigny-sur-Somme, France, 17 December 942.1,2

Guillaume married (1) Sprota, whose ancestry is unknown (or not traced here);1,2 he married (2) Liégard de Vermandois, daughter of Heribert II, Count of Meaux, Soissons, & Vermandois and NN.1,3

For more information about Guillaume I "Longsword," Duke of Normandy, please see this Wikipedia article.

Family 1


Family 2

Liégard de Vermandois d. 985
This person was last edited on2 Apr 2021


  1. [S1954] Stewart Baldwin, The Henry Project: The Ancestors of King Henry II of England: An Experiment in Cooperative Medieval Genealogy on the Internet,, accessed 14 Aug 2016. Hereinafter cited as Baldwin, The Henry Project.
  2. [S520] Frederick Lewis Weis, Walter Lee Sheppard Jr., William R. Beall and Kaleen E. Beall, Ancestral Roots of Certain American Colonists Who Came to America before 1700… ., 8th ed. (Baltimore: Genealogical Publishing Co., 2004), 121E-19, further cited as Weis, Sheppard, Beall, and Beall, Ancestral Roots, 8th ed.
  3. [S1947] Douglas Richardson, Royal Ancestry: A Study in Colonial and Medieval Families (Five vols., Salt Lake City, Utah: s.p., 2013), 5:484 (Line A-6), further cited as Richardson, Royal Ancestry.
  4. [S520] Weis, Sheppard, Beall, and Beall, Ancestral Roots, 8th ed., 121E-20.