Despenser the Younger rose to become Chamberlain and a close advisor to King Edward II, much as Despenser the Elder had been. Despenser the Younger claimed the Lordship of Glamorgan in 1317[4] through his wife Eleanor de Clare. He then accumulated more lands in the Welsh Marches and in England. At various points he was a knight of Hanley Castle in Worcestershire, Constable of Odiham Castle, and the Keeper of Bristol Castle, Portchester Castle and Dryslwyn Castle plus their respective towns, and the region of Cantref Mawr in Carmarthenshire.