Gao Xianzhi

Gao Xianzhi or Ko Sŏnji was a Tang dynasty general of Goguryeo descent. He was known as a great commander during his lifetime. He is best known for taking part in a number of military expeditions to conquer the Western Regions, over the Pamir Mountains and reaching as far as the Talas River. In 751 he commanded the Tang forces during the Battle of Talas, fighting against the Abbasid Caliphate. The Tang defeat at the Talas River is considered to mark the end of both Tang western expansion and Abbasid eastern expansion.