Zhang Yue

Zhang Yue, courtesy name Daoji (道濟) or Yuezhi (說之), posthumous name Duke Wenzhen of Yan (燕文貞公), was a Chinese historian, military general, poet, and politician of the Tang and Wu Zhou dynasties. He served as chancellor on three occasions during the reigns of Emperor Ruizong and under Emperor Xuanzong. He was known for having suggested the transition of Tang central government armed forces from being conscription-based to recruitment-based, and for turning the office of the chancellor into a specialized post with strong executive powers.