Fulk FitzRoy was an illegitimate son of Henry I of England

Henry I of England

Henry I was the fourth son of William I of England. He succeeded his elder brother William II as King of England in 1100 and defeated his eldest brother, Robert Curthose, to become Duke of Normandy in 1106...

 and Anfide, one of his mistresses. He was a monk at Abingdon

Abingdon

Abingdon may refer to the following places:In Australia :* Abingdon, Queensland, a place in Northern QueenslandIn Britain:*Abingdon, Oxfordshire**Abingdon School**Abingdon Abbey**Abingdon Lock**Abingdon Bridge**Abingdon Air & Country Show...

. Since he was illegitimate and couldn't claim the throne, little is known about him. He, along with his fellow illegitimate siblings and half-siblings, was often overlooked when the royal family was discussed and presented.