 About the defectors to Yuan side, the Emperor issued an order in which the family name of every defected member of Trần clan was changed to Mai, for example Trần Kiện was renamed as Mai Kiện, being the only defected prince of Trần clan, Trần Ích Tắc was exempted from this order but he was called in historical accounts of the Trần dynasty by the name "Ả Trần" ("the woman named Trần") meaning that Trần Ích Tắc was "coward as a woman".The Retired Emperor Trần Thánh Tông died on May 25 of the Lunar calendar, 1290 at the age of 50.He was buried in Dụ Lăng with the posthumous name Huyền công thịnh đức nhân minh văn vũ tuyên hiếu hoàng đế (玄功盛德仁明文武宣孝皇帝).