Goguryeo Period
After Goguryeo's victory in the Goguryeo–Sui Wars, in 631 Goguryeo began the fortification of numerous military garrisons after the Tang Dynasty, the successor to the Sui in China, began incursions from the northwest. Its construction was supervised by Yeon Gaesomun during the reign of King Yeongnyu. The preparation and coordination was completed in 647, after which Yeon Gaesomun took control of the Goguryeo court in a coup.
The network of fortresses ran for approximately 1000 li in what is now called Manchuria, from Buyeoseong (부여성, 扶餘城) (present-day 農安) to the Bohai Bay.
The most important of the garrisons were as follows:
- Bisa (Hangul :비사성, Hanja :卑沙城, present-day Jinzhou County in Dalian)
- Geonan (Hangul :건안성, Hanja :建安城, present-day Gaixian)
- Ansi (Goguryeo :안촌홀(安寸忽, Hangul :안시성, Hanja :安市城, near present-day Haicheng in Anshan Prefecture)
- Baegam (Hangul :백암성, Hanja :白巖城, in present-day Dengta County of Liaoyang prefecture)
- Yodong (Hangul :요동성, Hanja :遼東城, just to the east of present-day Liaoyang)
- Gaemo (Hangul :개모성, Hanja :蓋牟城, present-day Shenyang)
- Hyeondo (Hangul :현도성, Hanja :玄菟城)
- Shin (Hangul :신성 Hanja :新城, present-day Fushun)
- Buyeo (Hangul :부여성, Hanja :扶餘城, present-day Nongan Prefecture in Changchun)
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