Balhae

Balhae, also known as Parhae or Bohai, was a multiethnic kingdom established in 698 CE by Tae Choyŏng. Originally called the Kingdom of Jin until 713, it encompassed parts of modern Northeast China, the northern Korean Peninsula, and the southeastern Russian Far East. Its founding involved Goguryeo and Mohe people. Balhae's early relationship with the Tang dynasty was contentious, but later became cordial, with Tang recognizing it as the "Prosperous Country in the East." Balhae adopted some Tang administrative systems and its culture showed influences from Goguryeo, Mohe, Khitan, Tang, and Japanese elements. The kingdom was conquered by the Khitan-led Liao dynasty in 926 CE.