Trn Nhn Tng (7 December 125816 December 1308), personal name Trn Khm, temple name Nhn Tng, was the third monarch of the Trn dynasty, reigning over i Vit from 1278 to 1293. After ceding the throne to his son Trn Anh Tng, Nhn Tng held the title Retired Emperor (Vietnamese: Thi thng hong) from 1294 to his death in 1308. During the second and third Mongol invasions of i Vit, the Emperor Nhn Tng and his father the Retired Emperor Thnh Tng were credited with the decisive victory against the Yuan dynasty and would thenceforth establish a long period of peace and prosperity over the country.

Trần Thánh Tông (October 12, 1240 – July 3, 1290), personal name Trần Hoảng (陳晃), was the second emperor of the Trần dynasty, reigning over Đại Việt from 1258 to 1278. After ceding the throne to his son Trần Nhân Tông, Thánh Tông held the title of retired emperor (Thái thượng hoàng) from 1279 to his death in 1290. During the second and the third Mongol invasions of Đại Việt, Retired Emperor Thánh Tông and Emperor Nhân Tông were credited as the supreme commanders who led the nation to the final victories and, as a result, established a long period of peace and prosperity over the country. With his successful rulings in both military and civil matters, Trần Thánh Tông was considered one of the greatest emperors of not only the Trần dynasty but also the whole dynastic era in the history of Vietnam.