The Tr?n dynasty also adopted a novel method to practice new emperors: each time a crown prince achieved the age of 18, his predecessor would abdicate and turn the throne above to him, nevertheless Keeping the title of Retired Emperor (Thái Th??ng Hoàng), acting like a mentor to the new Emperor.Ti?p c?n b?ng ng??i Vi?t buôn ng??i: bán su?t ‘?