Gwanggaeto Stele
The Jumong myth is first attested in the fifth-century Gwanggaeto Stele, but the first-century Chinese text "Lunheng" describes a barbarian tale of a good archer who crosses a river on the backs of fish and turtles to found a new kingdom in the south. However, this figure's mother is a slave-girl impregnated by an egg-like energy rather than a goddess who gives birth to a physical egg, and the figure himself founds the kingdom of Buyeo, rather than that of Goguryeo. The Goguryeo foundation myth thus incorporates the myths of Haemosu and Yuri and the Buyeo foundation myth into a single narrative.