Kublai Khan

Kublai Khan was the leader who initiated the Mongol invasions of Japan. Kublai Khan was the grandson of the great Mongol conqueror, Genghis Khan. He was the founder of China's Yuan (Mongol) Dynasty and was a brilliant general and statesman. He established himself at Cambaluc (modern Beijing); the splendour of his court was legendary.
Now I speak of Kublai's influence in the invasions of Japan. In 1266, the Mongol ruler Kublai Khan paused in his campaign to subdue all of China, and sent a message to the Emperor of Japan.
he addressed the Emperor as "the ruler of a small country," and advised the Japanese to pay him a tribute or there would be serious consequences. The Khan's emissaries returned from Japan without an answer. Five times over the next six years, Kublai Khan sent his messengers the Japanese refused to even let them land on the island. In 1271, Kublai Khan defeated the Song Dynasty, and declared himself the first emperor of China's Yuan Dynasty. He ruled over much of China and Korea. As early as 1272, Kublai Khan wanted to launch a strike against Japan.