Jayavarman VII becomes Khmer king, bringing the empire to its greatest extent and building Angkor Thom and the Bayon.
Empress Lý Chiêu Hoàng cedes the throne to her husband Trần Cảnh (Trần Thái Tông), founding the Trần dynasty under the regency of Trần Thủ Độ.
Tai leaders break from Khmer control and found Sukhothai, often regarded as the first Thai kingdom.
King Suryavarman II builds Angkor Wat, originally a temple to Vishnu and today the largest religious monument in the world.
Mongol forces under Uriyangqadai occupy Thăng Long but withdraw after the Battle of Đông Bộ Đầu.
Historian Lê Văn Hưu completes the Đại Việt sử ký, the first official national history of Vietnam.
Lý Thường Kiệt halts the Song invasion at the Như Nguyệt (Cầu) River; tradition links the poem "Nam quốc sơn hà" to the battle.