Wikipedia
was a counselor of the second rank in the Imperial court of Japan. The role dates from the 7th century.
The role was eliminated from the Imperial hierarchy in 701, but it was re-established in 705. This advisory position remained a part of the Imperial court from the 8th century until the Meiji period in the 19th century.
This became a Taihō Code office in the early feudal Japanese government or daijō-kan.
In the ranks of the Imperial bureaucracy, the Chūnagon came between the Dainagon (major counselors) and the Shōnagon (minor counselors). Imperial honors included the sometimes creation of a temporary or .
The number of Chūnagon has varied, from three in 705 to four in 756. There were eight in 1015; and in later years, there were up to ten Chūnagon at one time.