When there is an event in a temple, they hang a flag called Dang at the entrance of the temple. Two posts support the flagpole. Nammunno, Sangdang-gu in Cheongju-si City where the flagpole stands is the place where Yongdusa Temple used to be situated. The temple was founded in the 13th year (962) of King Gwangjong in Goryeo Era, but it was shut because of frequent warfare and fighting late in Goryeo Era. Now the road has changed to the busiest one in the city of Cheongju. The flagpole remains as it used to be with the supporting stone and two posts. The two posts have protruding vertical lines in the middle of the outside face, making some variation on the monotonous surface. Between the two pasts, twenty cylinder-like iron tubs gear into each other of, making up the flagpole. There is a fastening device like a crossbar at the top of the stone posts to firmly fasten the flagpole. Especially, there is a record about the motivation and process of building iron flagpole at the face of the third iron tub. It says that they cumulated thirty iron tubs at first. The flagpole was set up together with the temple in the 13th year (962) of King Gwangjong in Goryeo. It is considered as a precious relic because we can know the exact time. The case that flagpoles remain is rare in Korea and we can see flagpoles only at three places of Gabsa Temple in Gongju, Chiljangsa Temple in Anseong, and here. So this is one of rare and precious flagpoles. There is a legend concerning this relic in Cheongju. The story is as follows. From the old times, the people in Cheongju suffered from a lot of disasters due to floods. Then an astrologer said that they would be able to avoid the disaster if they built a large mast, because the area would take a ship-like shape. After all, they say, the area avoided the disaster by building a flagpole as a mast. From this, Cheongju came to be named Juseong (Ship Castle).

(출처 : 문화재청 홈페이지)