Trần Duệ Tông succeeds his brother Trần Nghệ Tông as King of Vietnam.

Trần Duệ Tông, real name Trần Kính (陳曔), was the ninth emperor of the Trần dynasty who reigned Vietnam from 1373 to 1377. Duệ Tông succeeded the throne from his brother Trần Nghệ Tông who was credited with the re-establishment of Trần clan's ruling in Vietnam from Hôn Đức Công. During his short-lived reign, Duệ Tông had to witness the rising of Hồ Quý Ly in the imperial court and several consecutive attacks in Vietnam from Chế Bồng Nga, king of Champa. In 1377 Duệ Tông decided to personally command a major military campaign against Champa, this campaign was ended by the disastrous defeat of Trần's army in Battle of Vijaya where Duệ Tông himself was killed in action with many other high-ranking mandarins and generals of Vietnam. Duệ Tông's death was one of the main events that led to the collapse of Trần Dynasty in 1400.

Trần Nghệ Tông, given name Trần Phủ (陳暊), was the eighth emperor of the Trần dynasty who reigned Vietnam from 1370 to 1372.

Vietnam, officially the Socialist Republic of Vietnam (SRV), is a country at the eastern edge of mainland Southeast Asia, with an area of about 331,000 square kilometres (128,000 sq mi) and a population of over 100 million, making it the world's fifteenth-most populous country. One of two communist states in Southeast Asia, Vietnam shares land borders with China to the north, and Laos and Cambodia to the west. Its capital is Hanoi and its largest city is Ho Chi Minh City.

November 9 is the 313th day of the year in the Gregorian calendar; 52 days remain until the end of the year.