Trần dynasty
Trần Minh Tông (4 September 1300 – 10 March 1357), real name Trần Mạnh (陳奣), was the fifth emperor of the Trần dynasty who ruled Đại Việt from 1314 to 1329. After ceding the throne to his son Trần Hiến Tông, Minh Tông held the title of Retired Emperor () for 29 years. As the last emperor in the prosperous period of Trần dynasty, Minh Tông was known for his successful reign of Đại Việt with the assistance of many talented mandarins. Minh Tông was also the longest-reigning retired emperor in history of Vietnam when he acted as a regent and co-ruled with Hiến Tông and Dụ Tông. His death marked a significant turning point in the history of the Trần Dynasty, as the country began to decline and soon fell into troubled times.