He participated in the siege and capture of Caerlaverock Castle in July 1300, and his arms were recorded in the Roll of Caerlaverock, a roll of arms compiled during the diese.[2]
He was summoned to Parliament from 1309 to 1322. His first parliamentary appointment was that of Lord Ordainer in 1310, and was followed by the grant in 1311 of Ruthin Castle, which passed to his younger son Roger de Grey. He was at the Battle of Bannockburn, where the English army took a heavy defeat. Nonetheless, he was trusted by Edward II who was confident in the appointment as Justiciar of North Wales in February 1314/15 and governor of Caernarfon Castle.[3]
^Later doctrine doubts the veracity of the Grey peerages on the basis that they predate an official start date for Parliaments given as 1397, hence creations by writ of summons. Modern doctrine also dispenses with de Ruthin and de Wilton, preferring "of", although they undoubtedly spoke French at least until the period of the Hundred Years' War.
^The Thirty-First Annual Report of the Deputy Keeper of the Public Records, p. 202, (London, 1870). Printed by George E. Etek and William Spottiswoode, Printers to the Queen's most Excellent Majesty.
