李昭皇
Trần Liễu was born in 1211 as the first son of Trần Thừa and grandson of Trần Lý, the head of the Trần clan in Lưu Gia village. During the troubled time under the reign of Lý Cao Tông, the Crown Prince Lý Sảm sought refuge in Trần Lý's family and decided to marry his beautiful daughter Trần Thị Dung, younger sister of Trần Thừa, in 1209. Afterward, it was the Trần clan who helped Lý Cao Tông and Lý Sảm restored the throne in Thăng Long, therefore the Emperor appointed several members of the Trần clan for high positions in the royal court such as Tô Trung Từ who was uncle of Trần Thị Dung, or Trần Tự Khánh who was Trần Thừa's younger brother. In 1211 the Crown Prince Lý Sảm was enthroned as Lý Huệ Tông after the death of Lý Cao Tông, by then the Trần clan's position began to rise in royal court. During this time, Trần Liễu was entitled by Lý emperor as Prince Phụng Càn (Phụng Càn vương) and married to Princess Thuận Thiên who was elder sister of Empress Regnant Lý Chiêu Hoàng.