Iron was exported from the reduced 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 existing working day Pusan) exported good stoneware pottery to Japan. Pottery manufacure flourished. The first Korean histories ended up published, employing movable type, which led to the world’s initial casting of steel form in 1403.