On this day in 1278 – Tr?n Thánh Tông, the second emperor of Vietnam's Tr?n dynasty, took up the title of retired emperor, but continued to co-rule with his son Nhân Tông for eleven more years. 
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On this day in 1278 – Tr?n Thánh Tông, the second emperor of Vietnam's Tr?n dynasty, took up the title of retired emperor, but continued to co-rule with his son Nhân Tông for eleven more years. 
