Gaveston was the son of one of the king's household knights whose lands lay adjacent to Gascony, and had himself joined Prince Edward's household in 1300, possibly on Edward I's instruction.
Gaveston era o fillo dun dos cabaleiros do rei Eduardo cuxas terras eran adxacentes a Gascuña, e unírase a casa persoal de Eduardo en 1300, posiblemente seguindo as instrucións do rei.