Trần Hưng Đạo (; 1228–1300), real name Trần Quốc Tuấn (陳國峻), also known as Grand Prince Hưng Đạo (Hưng Đạo Đại Vương - 興道大王), was a Vietnamese royal prince, statesman and military commander of Đại Việt military forces during the Trần dynasty, after his death, he was considered a god by the people and named Đức Thánh Trần (德聖陳) or Cửu Thiên Vũ Đế (九天武帝). Hưng Đạo commanded the Vietnamese armies that repelled two out of three major Mongol invasions in late 13th century. His multiple victories over the Yuan dynasty under Kublai Khan is considered among the greatest military feats in Vietnamese history. Origins Trần Hưng Đạo was born as Prince Trần Quốc Tuấn (陳國峻) in 1228 to Prince Trần Liễu, the elder brother of the new child emperor, Trần Thái Tông, after the Trần dynasty replaced the Lý family in 1225 AD. Later, Trần Liễu—the Empress Lý Chiêu Hoàng's brother-in-law at the time—was forced to defer his own wife (Princess Thuận Thiên) to his younger brother Emperor Thái Tông under pressure from Imperial Regent Trần Thủ Độ to solidify Trần clan's dynastic stability. The brothers Trần Liễu and Emperor Trần Thái Tông harboured grudges against their uncle Trần Thủ Độ for the forced marital arrangement. Trần Quốc Tuấn, his father Trần Liễu, and Emperor Trần Thái Tông had a very close relationship. Liễu would find great tutors to teach his son, Trần Quốc Tuấn, with the hope of one day becoming a great leader of Đại Việt and regain his family honour. On his deathbed, Liễu told his son to avenge what he felt was personal shame forced upon him and his brother, Trần Thái Tông, by the Imperial Regent Tran Thu Do. First Mongol invasion During the first Mongol invasion of Vietnam in 1258, Trần Hưng Đạo served as an officer commanding troops on the frontier. Second Mongol invasion In 1285, Kublai Khan demanded passage through Đại Việt for his Yuan army to invade the Kingdom of Champa (in modern-day central Vietnam). When the Đại Việt government refused, the Mongol army, led by Prince Toghan, attacked Đại Việt and captured the imperial capital Thăng Long (modern day Hanoi). The Emperor Emeritus Trần Thánh Tông and Emperor Trần Nhân Tông appointed Trần Hưng Đạo as the Commander-in-chief of the armies (Quốc công tiết chế thống lĩnh chư quân). The prince of Hưng Đạo initially built defensive lines in