Toghon [a] (died 1301) was the ninth son of Kublai Khan, founder of the Yuan dynasty.
[1] He demanded from Đại Việt (now modern Vietnam) a route to Champa, which would trap the Champan army from both north and south, but it was rejected by retired emperor Trần Thánh Tông, who was the de facto ruler of Đại Việt.
[1] Trần Thánh Tông had to offer princess An Tư to him to slow down the pace of the Mongol army.
[1] Later he ordered a withdrawal back to China, blaming the weather and diseas in Đại Việt.
[1] The Mongol navy was overwhelmed by Trần dynasty in Bạch Đằng river, and he retreated.