Youngest son of Gwon Seon, grandfather of Gwon Mun-hae, said to have built the Chogan head house
| Era | 조선 전기 |
| Clan | 예천 권씨 |
Gwon O-sang (權五常) is traditionally the youngest of Gwon Seon's five sons and the grandfather of Gwon Mun-hae, compiler of the Daedong unbu gunok. His hanja appears as 權五常 on Wikipedia but 權五相 in heritage commentary. Although the Obokmun brothers are said to have all held office, his specific posts and dates were not confirmed in this survey.
He is remembered today chiefly through the Chogan head house at Jukrim-ri, Yongmun-myeon, Yecheon. Reports in Gyeonggi Ilbo and Daegu Ilbo credit him with building the house and its detached hall, dating it to either the late 15th or late 16th century; another commentary notes both a theory that he founded it and a record that his son Gwon Ji first settled there, so even the builder is disputed.
The detached hall (byeoldang) was designated Treasure No. 457 on 23 June 1967. It is a four-bay by two-bay structure with a railed veranda on all sides, two bays of heated room and the rest an open hall; weapons were reportedly stored in the ceiling above the main beam against wartime need. The whole house was designated a National Folklore Cultural Heritage on 24 December 1984.
Through the hardships that followed his brother's execution and his father's exile, the Jukrim-ri base flowered again as a center of learning in his grandson's generation. Little else of O-sang's own life is recorded, so this page leaves unconfirmed parts blank rather than speculating.
The main house sits on a double base as a five-bay, five-beam structure; a shrine stands to the north and the Baekseunggak, which stores the printing blocks, to the southeast. Wings and the gate range link up into a square plan. It faces west, backed by the main mountain to the west and looking over fields to the east.
Accounts include a late 15th-century date, a chronology that lists 1589, and a vague "before the Imjin War". None is chosen here; all are noted.
His grandson was Gwon Mun-hae; a son, Gwon Ji, is recorded.