The Hundred Years War began during Philip’s reign in 1337. Philip seized Aquitaine from the English, claiming that king Edward III of England had forfeited the territory for rebellion and disobedience. Philip’s position had merit. One of his trusted advisors, Robert III of Artois, had commited forgery attempting to procure an inheritance. Philip tried to capture Robert, who fled to England and was granted refuge by Edward. Philip then took Aquitaine, and Edward then invaded France to get the territory back.