Harold was a mesne-lord in Norfolk in 1086 (Domesday Book). Also possessed manor at Dalston, Cumberland, England. (1)

Disputed origins

Harold is an English name, and unlikely for a Frenchman in this period. He does not seem to appear in Domesday Book. (?)

Norman: surname Vaux or Vallibus derived from lordship near F(V)allaisa, Normandy. 4 Vaux brothers came to England with William the Conqueror in the Norman invasion of 1066. The family held a castle named de Vaux in Normandy until 1080.

However, Harald is not a Norman name, and no evidence supports Normandy origins. Not a known son of Sir Eustace de Vaux. Removed display name of Harold de Vaux of Normandy.

References

1. Fox/Vaux Lineage. (c) John W. Fox, updated 2004 - PDF attached
2. https://en.wikipedia.org/wiki/De_Vaux_family
3. https://www.familysearch.org/tree/person/details/GFM9-3JH
4. https://www.wikitree.com/wiki/Vaux-317