WD

William de Ros

1200 – 1264

Vitals

Born
c. 1200
Died
1264

Family

Parents
RD
Robert de Ros
1172 – 1227
IO
Isabel of Scotland
Spouse
LR
Lucy (de Ros)
Children
RD
Robert de Ros
1223 – 1285

About

William de Ros of Helmsley, elder son of the Magna Carta surety Robert de Ros, took the Yorkshire castle at the family division while his brother took Wark, and held it until his death about 1264. He married Lucy FitzPiers, and the Helmsley line ran on through their son.

Research notes

✓ DOCUMENTED (web-confirmed 25 Jul 2026): WILLIAM DE ROS of Helmsley (d.1264/65), the elder son of Robert de Ros the Magna Carta surety, who inherited HELMSLEY (his brother Robert took Wark). m. LUCY FITZPIERS. Father of Robert de Ros (our line). Direct ancestor. Added 25 Jul 2026.

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