Located in the wall north of Honghwamun Gate, Wolgeunmun Gate was built in 1779 by King Jeongjo (r. 1776-1800). As the name of the gate 'Wolgeun' (which literally means 'monthly audience') suggests, the gate was set up to materialize the king’s vow to visit Gyeongmogung Shrine to pay his homage to his father, Crown Prince Sado, whose spirit tablet was enshrined there. King Jeongjo kept his vow, indeed, and visited the shrine once or twice every month for twenty four years during which he served as king of Joseon.