 As Count of Orléans, Philip accompanied his father on the Eighth Crusade to Tunis in 1270.Shortly before his departure, Louis IX had given the regency of the kingdom into the hands of Mathieu de Vendôme and Simon II, Count of Clermont, to whom he had also entrusted the royal seal.After taking Carthage, the army was struck by an epidemic of dysentery, which spared neither Philip nor his family.