Tr?n Thái Tông (birth name: Tr?n C?nh, 17 July 1218 – 5 May 1277) was the first emperor of the Tr?n Dynasty, seated on the throne for 33 years (1226–58), being Grand Emperor for 19 years.
He reigned during the first Mongol invasion of Vietnam before eventually abdicating in favor of his son Tr?n Thánh Tông in 1258.