In 660, when a joint Silla-Tang alliance destroyed Baekje, the Tang dynasty established a protectorate named the Ungjin Commandery in its place. Furthermore, the Tang emperor offered to Munmu of Silla that he take over a proposed protectorate called the "Great Commandery of Gyerim", which was refused.[1]
Following the offer Silla launched a surprise attack against the Tang forces and destroyed the Ungjin commandery. Over the course of several battles Tang forces would be driven north of the Taedong river by the Silla army.[2]
In the south of Silla another administrative subdivision named Jimizhou was to be set up. Munmu of Silla was to be nominated as first "commander."[3][4] After that the position was to be inherited by the line of rulers of Silla.
In the 8th century, An Lushan Rebellion began, Ping Lu Fanzhen (Hanja:平盧藩鎮) was moved to Shandong Peninsula and renamed as Zi Qing Ping Lu Fanzhen (Hanja:淄青平盧藩鎮), Fanzhen attempted to hold a post of Commander of Gyerim Protectorate and crossed the sea for it.
^Seth, Michael J. (2020). A concise history of Korea: from antiquity to the present. Lanham, Maryland: Rowman & Littlefield. p. 45. ISBN978-1-5381-2898-5.
^Seth, Michael J. (2020). A concise history of Korea: from antiquity to the present. Lanham, Maryland: Rowman & Littlefield. p. 45. ISBN978-1-5381-2898-5.