Sanggung was an official title of the senior 5th rank (Hanja: 正五品; Jeong 5 pum), the highest attainable for gungnyeo, a lady-in-waiting during the Joseon Dynasty of Korea.
The book also has another record that Lady Han was appointed as sanggung in March 1031, the 22nd year of the king's reign.
[4][5] As a system on naemyeongbu (Hanja: 內命婦) which refers to women at court with a rank including queen and lady-in-waiting[6] was revised since the foundation of the Joseon Dynasty, female officers with the title, sanggung began to manage inner affairs of the court in general as the highest position of the gunggwan (literally a palace officer).
The former refers to a king's concubines or a crown prince's consort while gunggwan are female officers with a rank.
[4] The social status of sanggung generally belonged to the yangin (common people) class, distinguished from naegwan in policy.