 But because of the firm faith of the Emperor Thái Tông, grand chancellor Trần Thủ Độ and the talents of generals such as Prince Hưng Đạo Trần Quốc Tuấn and Lê Phụ Trần, the Trần dynasty was able to throw back the invasion and ultimately re-established the peace in Đại Việt in December 1257.Returned to the capital Thăng Long, Trần Thái Tông decided to cede the throne to Crown Prince Trần Hoảng, now Trần Thánh Tông, on the 24th day of the second lunar month (March 30) 1258.After the coronation, Thánh Tông changed the era name to Thiệu Long (紹隆, 1258–1272).