Jinhan is situated in the middle part of the southern peninsula, Mahan in the southwest, and Byeonhan in the southeast.

The state of Baekje, which will soon come to exercise great influence on Korean history, emerges first in the Mahan area; it is not certain when this happened, but Baekje certainly exists by CE 246 because Lelang mounts a large attack on it in this year.

That Baekche is a centralized, aristocratic state melding Chinese and indigenous influence is not in doubt, nor is its growing power: within a century, Baekje has demolished Mahan and continues expanding northward into what today is the core area of Korea, around Seoul.

It is thought that the Korean custom of father-to-son royal succession began with King Kun Ch'ogo (reigned ca. 346-75) of Baekje.

His grandson inaugurates another long tradition by adopting Buddhism as the state religion in 384.