Gwanggaeto Stele
The founding myths of Goguryeo are related in ancient writings, including the Gwanggaeto Stele. The best-known version is found, with slight variations, in the "Samguk Sagi", "Samgungnyusa", and the "King Dongmyeong" chapter () of the "Donggukisanggukjip" (). The Hae clan was probably the royal house before the Buyeo clan replaced them, and both clans appear to be descended from the lineage of Buyeo and Goguryeo. The royal family of Buyeo had the surname "Hae". The founding monarch of Goguryeo, Jumong had the surname "Hae" but the surname was later changed to Go (高). The chinese character (解) means "to loosen; to unfasten; to untie or to explain". It also means "sun" in Korean as Buyeo, Goguryeo and Baekje were deeply involved in Sun Worship.