 Complete the following phrase:  Minh Tông was born in 1300 as Trần Mạnh, the only surviving son of emperor Trần Anh Tông and imperial consort Huy Tư, who was the daughter of general Trần Bình Trọng. According to Đại Việt sử ký toàn thư, the precise birthday of Prince Trần Mạnh was 21 August in the lunar calendar, only one day after the death of Trần Hưng Đạo who was the most important minister in the early Trần dynasty and the main commander of second and third 