Iron was exported from the reduce Naktong River in southeastern Korea to Wae (Japan) and Lolang. A fourth kingdom of Kaya in the considerably southeast (west of the Naktong River and current day Pusan) exported high-quality stoneware pottery to Japan. Pottery manufacure flourished. The initial Korean histories were posted, utilizing movable form, which led to the world’s to start with casting of metallic form in 1403.