He was elected to his highest position by a kurultai after the death of his brother Mongke.
This leader employed mangonels built by two Muslim engineers in the successful siege of Xiangyang. Later, this ruler ordered failed invasions of Java and Hakata Bay. This ruler divided his population into four social classes, defeated the Southern Song dynasty, and established (*) paper money as the sole currency. He was elected to his highest position by a kurultai after the death of his brother Mongke. Il Milione depicted one traveler's experiences in this man's court at Dadu. This leader, whose two invasions of Japan were stymied by kamikaze, was visited by Marco Polo. For ten points, identify this Mongol founder of the Yuan empire.
This leader employed mangonels built by two Muslim engineers in the successful siege of Xiangyang.
Kublai Khan