aesong fell under the hand of
Gung
Ye, the founder of his short-lived state,
Later
Goguryeo, and than subsequently became a part of
Goryeo
in 919 by its founder,
Wang Geon. Wang Geon established the
capital in the south of Songak, and incorporated Kaesong County into Songak
under the name of "Gaeju". In 919, Kaesong became the national
capital. In 960, the 11th year of
King
Gwangjong's reign, the city was renamed as Gaegyeong, and in 995, the 14th year
of
King Seongjong's reign, it was
elevated as "Gaesong-bu". The Gaeseong-bu is a combined term of
Songak-gun, and Gaesong-gun, which is different from the region of the pre-1945
Gaesong-ri, Seo-myeon, Kaepung-gun. In 1010, the first year of
King Hyeonjong's reign, the palace and
houses were almost burnt down during the
Second
Goryeo–Khitan War, so in 1018, Gaesong-bu was relegated for the "bu"
system, and became to govern the three hyeon unites of Jeongju, Deoksu, and
Gangeum.
In the late 12th
century, there was a period of instability in both the government and the
countryside. A slave named
Manjǒk
(or spelled as Manjeok) led a group of
slaves who gathered outside Kaesong in 1198. The revolt plot was suppressed by
Choe Chung-heon.
When
Yi
Songgye
