 Complete the following phrase:  Tran Thai Tongs successors Tran Thanh Tong r. 12581278 and Tran Nhan Tong r. 12781293 continued to send tribute to the new Mongol-led Yuan dynasty. In 1283, Yuan emperor Kublai Khan launched the invasion of Champa. In early 1285 he commissioned prince Toghon to led the second invasion of Dai Viet to punish the Vietnamese Emperor Tran Nhan Tong for not helping the Yuan campaign in Champa and refusing to send tribute. Kublai also appointed Tran Ich Tac, a Tran prince dissent as the puppet Emperor of Dai Viet. Yuan forces though initially captured Hanoi, however, were defeated by ChamVietnamese alliance in June. In 1288 they decided to launch the third and also the largest invasion of Dai Viet but were repelled. Prince Tran Quoc Tuan ended the Mongol yokes through an 