李惠宗
Thuận Thiên was born as Lý Ngọc Oanh, entitled as Princess Thuận Thiên, the first child of the Emperor Lý Huệ Tông and his wife Lady Thuận Trinh Trần Thị Dung. Thuận Thiên was born not in royal palace but in Cửu Liên Marsh (now Yên Mỹ District, Hưng Yên) in June 1216 when Lý Huệ Tông and Lady Thuận Trinh escaped capital Thăng Long to the garrison of general Trần Tự Khánh, Trần Thị Dung's brother, in order to avoid the intention of killing Lady Thuận Trinh by Empress Mother Đàm who always distrusted her as a member of the powerful Trần clan. Thuận Thiên had a younger sister, Princess Chiêu Thánh, who ultimately became the Empress Regnant Lý Chiêu Hoàng, the last emperor of the Lý dynasty. During the reign of Huệ Tông and Chiêu Hoàng, Thuận Thiên married to Prince Phụng Càn (Vietnamese: Phụng Càn vương) Trần Liễu who was her cousin.