Lý Huệ Tông (chữ Hán 李惠宗; born Lý Sảm; 1194 – 1226) was the king of Vietnam from 1211 to 1224, the penultimate leader of the Lý Dynasty. During Lý Huệ Tông's rule, many members of the Trần family assumed key roles in the government, including Trần Thủ Độ. The Trần family later used its position of power to place a young Trần Cảnh (temple name Trần Thái Tông) on the throne to found the Trần Dynasty.
In 1224, Lý Huệ Tông became mentally ill and the issue of succession became pressing. He had produced no male heirs, and so appointed his seven-year-old daughter Lý Chiêu Hoàng as his successor. Although a female ruler would likely not have been normally acceptable to the court, Trần Thủ Độ had a scheme to end the Lý Dynasty and place a Trần on the throne which depended on the existence of a young empress, and so Lý Chiêu Hoàng was accepted as empress. Lý Huệ Tông retired to become a Buddhist monk, although he lived only two more years. In 1226 Trần Thủ Độ, while consolidating power of the newly founded Trần Dynasty by eliminating Lý family members and potential pretenders, induced Lý Huệ Tông to commit suicide.
^Anh Thư Hà & Hồng Đức Trần (2000). A Brief Chronology of Vietnam's History. p. 70. By the end of 1210, Sảm ascended the throne as King Lý Huệ Tông and appointed Trân Thị Dung as royal concubine and, in mid-1216, as Queen. Lý Huệ Tông and Trân Thị Dung had two princesses: Thuận Thiên (who got married to Trân).
Chapuis, Oscar. A History of Vietnam: From Hong Bang to Tu Duc. pp. 79–81. Greenwood Publishing Group: London. 1995. Volume 5.