sentences:  In his youth he at first converted to Buddhism, and then later to Sunni Islam with his brother Ghazan, and changed his first name to the Islamic "Muhammad".In April 1305, Oljeitu sent letters to Philip IV of France, Pope Clement V, and Edward I of England.As had his predecessors, Oljeitu offered a military collaboration between the Mongols and the Christian nations of Europe, against the Mamluks.