The Champa–Đại Việt War (1367–1390) was a costly military confrontation fought between the Đại Việt kingdom under the ruling Trần dynasty and the kingdom of Champa led by the King of Chế Bồng Nga (r. 1360 – 1390) in the late 14th century, from 1367 to 1390. By 1330s, Đại Việt and Khmer Empire (a historic rival of Champa) both felt into swiftly declining due to climate changes, population expansion, widespread bubonic plague, famines and many other factions, which contributed to Champa's resurgence of the 14th century. In 1360, Chế Bồng Nga, son of king Chế A Nan was enthroned as king of Champa, reunited the Chams under his banner, and in 1367 he demanded Trần Dụ Tông the return of two former provinces Ô and Lý (Quảng Trị and Thừa Thiên Huế) to Champa. Declined to this demand, Trần Dụ Tông