Gilbert FitzRoy was an illegitimate son of

Henry I of England Henry I (c. 1068 – 1 December 1135), also known as Henry Beauclerc, was King of England from 1100 to his death in 1135. He was the fourth son of William the Conqueror and was educated in Latin and the liberal arts. On William's death in ...

. His maternity is unknown as well as almost everything about him, except that he was still young and unmarried in the 1140s.Given-Wilson and Curteis ''Royal Bastards'' p. 71 He died before 1143, at the age of ~12. His mother was likely either

Isabella de Beaumont Isabella de Beaumont (died 1334), was a prominent noblewoman allied to Isabella of France during the reign of Edward II of England. Reign of Edward I and marriage Isabella de Beaumont was the daughter of Sir Louis de Brienne and Agnés de ...

, Nest ferch Rhys, or Sybil Corbet.

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References

* 12th-century English people Illegitimate children of Henry I of England 12th-century deaths Year of birth unknown Sons of kings {{England-bio-stub