This polity first developed agriculture during its Mumun period. Its nobility was divided into classes called "sacred bone" and "true bone" during its rule by the Kingdom of Silla, and it was later ruled by the Gokoryo Dynasty established by Wang Kon. It defended itself from foreign invaders with hwachas and turtle ships during its final dynasty, the Choseon, and it was divided at the 38th Parallel in an agreement signed 
This polity first developed agriculture during its Mumun period. Its nobility was divided into classes called "sacred bone" and "true bone" during its rule by the Kingdom of Silla, and it was later ruled by the Gokoryo Dynasty established by Wang Kon. It defended itself from foreign invaders with hwachas and turtle ships during its final dynasty, the Choseon, and it was divided at the 38th Parallel in an agreement signed in its city of Panmunjeom. For 10 points, name this Asian location currently divided into countries led by Lee Myung-bak and Kim Jong-il.
This polity first developed agriculture during its Mumun period.