Sibyl de Tregoz

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ChartsAncestors of Adele La Force
Ancestors of Harriet Hanson Robinson
Sibyl de Tregoz, daughter of Sir John de Tregoz, Knt., Lord Tregoz and Mabel FitzWarin, died about 21 October 1334.1

Sibyl married, as his 2nd wife, Sir William de Grandison, Knt., 1st Lord Grandison, son of Pierre de Grandison, seigneur of Grandson and Agnès de Neufchâtel, before 1285.1,2


Sir William de Grandison, Knt., 1st Lord Grandison b. aft. 1242, d. 17 Jun 1335
  • Katherine de Grandison+1 b. aft. 1285, d. 23 Apr 1349
  • William de Grandison, Archdeacon of Exeter1 b. aft. 1285
  • Sir Otes de Grandison, Knt.1 b. aft. 1285
  • Thomas de Grandison3 b. aft. 1285
  • Edmund de Grandison1 b. aft. 1286
  • Sir Peter de Grandison, Knt., 2nd Lord Grandison1 b. aft. 1286, d. 10 Aug 1358
  • John de Grandison, Bishop of Exeter, 3rd Lord Grandison1 b. aft. 1286, d. 16 Jul 1369
  • Mabel de Grandison1 b. aft. 1286
  • Maud de Grandison1 b. aft. 1286
  • Agnes de Grandison1 b. aft. 1286, d. 3 Dec 1348
This person was last edited on14 Jun 2021


  1. [S1947] Douglas Richardson, Royal Ancestry: A Study in Colonial and Medieval Families (Five vols., Salt Lake City, Utah: s.p., 2013), 3:97 (Grandison 2), further cited as Richardson, Royal Ancestry.
  2. [S2180] David Williams, "The First Marriage and Issue of William de Grandison, 1st Lord Grandison (d.1335)," Foundations: Journal of the Foundation for Medieval Genealogy 10 (2018): 89-97, at 89, further cited as Williams, "William de Grandison."
  3. [S1947] Richardson, Royal Ancestry, 3:99 (Grandison 2).