Duji was a circuit of the Chinese Táng Empire. It was established by Emperor Xuánzōng and covered today's Luòyáng (then Dōngdū / Henan Prefecture [''Hénán Fǔ'']) and the area around it. Duji Circuit was succeeded by the Song dynasty's Jingxibei Circuit (Jīngxīběi Dào). It contained three prefectures: Dōngdū (Chinese: 東都), Luòzhōu (Chinese: 洛州), and Rǔzhōu (Chinese: 汝州).