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 Nest ferch Rhys (c. 1085 – c. 1136) was the daughter of Rhys ap Tewdwr, last King of Deheubarth in Wales, by his wife, Gwladys ferch Rhiwallon ap Cynfyn of Powys. Her family is of the House of Dinefwr. Nest was the wife of Gerald de Windsor (c ...

, or

Sybil Corbet Sibyls were oracular women believed to possess prophetic powers in ancient Greece. Sybil or Sibyl may also refer to: Films * ''Sybil'' (1921 film) * ''Sybil'' (1976 film), a film starring Sally Field * ''Sybil'' (2007 film), a remake of the 19 ...

Citations

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