Trần Nhân Tông (1258-1308) was the third emperor of the Trần dynasty in Vietnam. He is best known for his leadership during the Mongol invasions of Vietnam, successfully defending the country against multiple attacks and securing its independence. After his reign, Trần Nhân Tông became a prominent Buddhist monk, founding the Trúc Lâm school of Zen Buddhism. His teachings emphasized meditation and compassion, significantly influencing Vietnamese culture and spirituality. He is remembered as a national hero and a key figure in the development of Vietnamese Buddhism.