According to archaeological evidence in the third and fourth centuries some of the city-states of Byeonhan evolved into the Gaya confederacy, which was later annexed by Silla, one of the Three Kingdoms of Korea.
Arkæologiske fund fra tredje og fjerde århundrede viser, at nogle af bystaterne i Byeonhan udviklede Gaya-forbundet, som senere blev annekteret af Silla, et af de tre kongeriger i Korea.