During the Three Kingdoms period, Korea was divided into three competing states, Goguryeo, Baekje, and Silla, whose boundaries ran from Manchuria to the tip of southern Korea. 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. Sundo, a monk from Former Qin, a northern Chinese state, was received by the king of Goguryeo in northern Korea in 372 and an Indian monk via Serindian, Malananda (Kr. Marananta), from southern China's Eastern Jin Dynasty was received by the king of Baekje in the southern Korea in 384. Ado - a Buddhist monk brought Buddhism to Silla in central Korea. Archaeological discoveries have corroborated these assertions of the early introduction of Buddhism into Korea with the discovery of Goguryeo tomb murals with Buddhist motifs and the excavation of lotus shaped roof tiles dated to the 4th century. The rulers of both Korean kingdoms welcomed the foreign monks and immediately ordered monasteries be built for their use. The construction of Buddhist images soon followed.