The Samguk sagi records that "he was seven feet tall and unusually exceptional in his power".
[2] Even assuming that the dates given in the Samguk sagi are accurate, Baekje through Gusu's reign was probably a confederacy, not yet a kingdom.
However, the Samguk sagi records many Baekje defeats against the Mohe and Silla, as well as natural disasters towards the end of Gusu's reign.
Samguk sagi: Upon Gusu's death, his eldest son Saban briefly became the 7th king.
Saban was dethroned by Goi, reported as Chogo's brother in the Samguk sagi, but believed to be of a rival royal line by modern scholars.