Guy served King Henry III and Queen Eleanor of Provence, who paid him to accompany their second son, Edmund Crouchback, on the Crusade of 1271.
After Edward I succeeded Henry III in 1272, Guy remained in Eleanor's household first as a knight and later as her steward until her retirement to Amesbury Priory in 1286.
At the same time, Guy intervened on behalf of a foreign priest of Wood Norton named Reymund, who daily said mass at Amesbury for the soul of Eleanor and was likewise exempted from the king's order.
They are both recorded in the Galloway Roll, where the elder's canting arms are described as "gules a mill-rind (fer de moulyn) ermine".
Uncle and nephew appear some 300 times in contemporary sources but are only occasionally distinguished as elder (senior) and younger (iunior).