Changuimun (Jahamun)

Seoul Fortress had four main gates (四大門) in the east, west, south, and north, and four small gates (四小門) in between. Changuimun is the north small gate (北小門) between the west main gate and the north main gate, meaning 'to reveal what is right.' However, Changuimun was never called the north small gate; it has been known by the nickname 'Jahamun (紫霞門),' taken from the name of the valley here.

In 1413 (the 13th year of King Taejong's reign), it is said that the geomancer Choi Yang-seon advised, 'Changuimun and Sukjeongmun are like the two arms of Gyeongbokgung Palace, so roads should not be opened to harm the earth's vein.' This advice was accepted, and both gates were closed, with pine trees planted to prohibit passage. However, in 1422 (the 4th year of King Sejong's reign), the gate was allowed to be used as a passage for soldiers. According to records from the Annals of the Joseon Dynasty, in 1617 (the 9th year of King Gwanghaegun's reign), the gate was opened to transport stone materials during palace repairs, suggesting that a road existed there even then.