 Prince Trần Khâm was entitled as Crown Prince of the Trần dynasty in December 1274, he had a younger brother, Prince Tá Thiên Trần Đức Việp (born in 1265) and an elder sister, Princess Thiên Thụy, who would die on the same day as her brother Nhân Tông.Always concerned with the education of his son, in 1274, Trần Thánh Tông appointed the prominent mandarin and general Lê Phụ Trần in the position of the crown prince's professor with two famous scholars Nguyễn Sĩ Cố and Nguyễn Thánh Huấn as assistants, the Emperor himself also composed poems and a literary work named "Di hậu lục" to educate prince Trần Khâm.On the 22nd of the tenth lunar month (November 5) 1278, Trần Thánh Tông decided to cede the throne to the Crown Prince Trần Khâm, now Trần Nhân Tông, and held the title Retired Emperor.