 A fourth polity in the south, Gaya also flourished during this period but no Buddhist image can be definitively attributed to this state.According to the "Samguk sagi" and "Samguk yusa", the two oldest extant histories of Korea, Buddhism was officially introduced to Korea during the 4th century.In addition, the "Haedong goseungjeon" states that monks from China were already in Korea prior to its official reception.