낙랑군
In its early history, Okjeo oscillated between domination by the Chinese commanderies and by Goguryeo. From the 3rd century BCE to 108 BCE, it was controlled by Gojoseon. At 107 BCE, it became part of the Xuantu Commandery.As the Xuantu Commandery retreated towards the liadong peninsula as a result of expansion of Goguryeo, East okjeo became part of the eastern part of the Lelang Commandery.