 In 1257 he served in the army of Lord Edward as part of his campaign in Wales, and became part of an influential group of his supporters.He joined Edward in autumn 1259 when he allied with Simon de Montfort, and was made custodian of Bristol Castle in November.He was part of Edward's retinue in 1260 when he and the Earl of Gloucester attempted to take London, and was one of those pardoned when Edward patched up his relationship with Henry III.