Genghis Kahn was the founder and first emperor of the Mongol empire
Kublai Kahn was the grandson of Genghis Kahn . He was also the founder of the Yuan Dynasty in 13th century china.
The Mongols are an East Asian ethnic group native to Mongolia and to China's Inner Mongolia Autonomous Region.
Kublai planned for the fleet to first attack Tsushima Island and Iki Island before making landfall in Hakata Bay. There were 4,400 ships involved, and around 29,000 soldiers.
The invaders defeated a final Japanese cavalry charge around nightfall. After their victory at Komoda, the Yuan forces burnt down most of the buildings around Sasuura and slaughtered most of the inhabitants.
Kublai Khan attempted twice to invade, but with each time they had disastrous results!
After the first failed attack, Kublai sent an even larger fleet to attack Japan, and they failed once again.
The Mongols decided to not invade Japan because their last two attempts were fails. The Japanese were grateful about their choice to not invade Japan.