Gwanggaeto the Great
He was the son of the 16th king Gogugwon, who was killed by prince and future Baekje king Geungusu in the latter's assault on Pyongyang Castle. Gogugyang was also the younger brother of the 17th king Sosurim, and the father of the 19th king Gwanggaeto the Great. Gogugyang rose to the throne when Sosurim died without a son.