 Goguryeo was revived once more in 918 by successor state Goryeo, founded by Wang Geon, a descendant of Goguryeo nobility.In 937, much of the ruling class and the last crown prince of collapsed Balhae fled to Goryeo, where he was warmly welcomed and included into the ruling family by Wang Geon, thus unifying the two successor nations of Goguryeo.In 395, Gwanggaeto the Great invaded the Khitan Baili clan to the west on the Liao River, destroying 3 tribes and 600 to 700 camps.