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Sir William de Ros of Helmsley was born circa 1193 to Robert de Ros (c1172-1226) and Isabel Avenal (c1170-) . He married Lucy FitzPiers (-c1266) . Alfred the Great (849-899)/s, Charlemagne (747-814)/s, Hugh Capet (c940-996)/s.


Offspring of Sir William de Ros of Helmsley and Lucy FitzPiers (-c1266)
Name Birth Death Joined with
Robert de Ros (c1230-1285)
William de Ros (c1240-)


Footnotes (including sources)

‡ General
  • Sir William on Genealogics, July 2010, which shows his brother Robert having issue but brothers Peter and Alexander with none, and names Lucy's parents, citing three books on her page
  • ROBERT de Ros "Fursan" and family on Medieval Lands, updated July 2010, which indicates unknown parentage for Lucy and no issue for William's brother Robert (with no other siblings shown)
  • Sir William on thePeerage, July 2010, which shows that his brothers John and Sir Robert had children but their lines go only a couple of generations, and names Lucy and her father
Ω Birth
  • Date guessed from parents' marriage date.
¶ Death
  • The above three sources agree on "c1264".

Robin Patterson