sentences:  But the Mongol leader Möngke replied with only a letter via William in 1254, asking for the King's submission to Mongol authority.Louis attempted a second crusade (the Eighth Crusade) in 1270.The Mongol Ilkhanate leader Abaqa wrote to Louis IX offering military support as soon as the Crusaders landed in Palestine, but Louis instead went to Tunis in modern Tunisia.