Goi is generally credited with centralising the Baekje kingdom, concentrating royal power and laying the foundation of the state structure.
Immediately upon taking the throne, he established a central military office to restrain the independence of regional clans.
The Samguk sagi also records that in 260, he established a central bureaucracy of six ministers(called jwapyeongs), sixteen rank levels, and a code of dress, although the full system may have been completed after his reign (see, e.g., Best (2002)).
[4] Samguk sagi: Under Goi's reign, Baekje expanded control of the Han River region and gained permanent ascendancy over the remaining states of the Mahan, a loose confederacy in the southwest of the Korean Peninsula.
However, fearing that Wei may launch a counterattack, Goi quickly sued for peace by returning his captives.