King Taejong Muyeol, born Kim Ch'un-ch'u, was the 29th ruler of Silla, one of the Three Kingdoms of Korea. He is credited for leading the unification of Korea's Three Kingdoms.
The bone-rank system was the system of aristocratic rank used in the ancient Korean kingdom of Silla. It was used to segregate society, and particularly the layers of the aristocracy, on the basis of
Relationship of Bone-Rank Gradations in Silla to Office Rank and Post