Jang Bogo
Jang Bogo was born as the son of a boatman and his childhood name was Gungbok. Gungbok means a good bow shooter, and he has excelled in martial arts and swam well since he was young. Gungbok, a native of Cheonmin, learned that he could not become a general in Silla, so he moved to Tang Dynasty and joined the army and changed his name to Jang Bogo. Meanwhile, Jang Bogo, who learned that the Silla people were suffering from pirates, eventually returned to Silla.