Hanseong

Hanseong (漢城, "fortified city [on] the Han [River]") (actual Seoul)

Situated on the Han River, Hanseong was founded in 18 BC by Baekje as Wirieseong, one of the Three Kingdoms of Korea.

It was thought that the kingdom that controlled the Han River valley would also have strategic control of the whole peninsula, because it was a center of transportation.

In 1104, King Sukjong of the Goryeo Dynasty built a palace in Namgyeong, which was then referred to as Namgyeong (남경; 南京) or "Southern Capital". Hanseong grew into a full-scale city with political significance during this time.