Lạc Long Quân is an ancient king of the Hồng Bàng dynasty of ancient Vietnam. Quân was the son of Kinh Dương Vương, the king of Xích Quỷ. He is the main figure in the Vietnamese creation myth of Lạc Long Quân - Âu Cơ. According to the myth, Lạc Long Quân married Âu Cơ, a mountain goddess.