Baekje

Baekje, the southwestern kingdom of Korea, lasted from 18 BCE to 660 CE as one of the Three Kingdoms with Goguryeo and Silla. Founded by Onjo, third son of Goguryeo's founder, at Wiryeseong in what is now southern Seoul, it claimed the Manchurian heritage of Buyeo and grew into the most populous of the three, some 3,800,000 souls in 760,000 households. At its fourth-century peak Baekje held most of western Korea to Pyongyang under King Geunchogo, pressed Goguryeo in the north, swallowed Gaya toward the Nakdong, and spread Buddhism and continental learning eastward as a maritime power. It warred and allied by turns with its peninsula rivals until Silla's Tang alliance proved fatal: Paekche fell in 660, and Uija's son Zenko carried the royal house to Japan as the Kudara clan. It warred and allied by turns with its peninsula rivals until Silla's Tang alliance proved fatal: Paekche fell in 660.