King of Yān [Cáo] Yǔ appellation Péngzǔ. Jiàn’ān Sixteenth Year , he was given fief as a capital village Marquis. Twenty-second Year , he was changed fief to Marquis of Lǔyáng. Huángchū second Year , he was advanced in rank to Duke. Third Year , he became King of Xiàpī. Fifth Year , he was changed in fief to Shànfù county. Tàihé Sixth Year , he was changed in fief to King of Yān.
Míng-dì when young with Yǔ together matured, and always specially favored him. At the ascension to the throne, his treatment and bestowal was with the other Kings different. Qīnglóng Third Year , he was summoned to enter Court. Jǐngchū Inaugural Year , he returned to Yè. Second Year  Summer, he was again summoned to visit the capital. Winter Twelfth Moon, Míng-dì was critically ill, and appointed Yǔ as General-in-Chief, to entrust him with later affairs. He received office for four days, Yǔ deeply and firmly declined; the Emperor’s intentions also changed, and therefore dismissed Yǔ from office. Third Year Summer , he returned to Yè.
During Jǐngchū, Zhèngyuán, and Jǐngyuán, he gradually increased in fief, joining with the previous to 5500 households. The Duke of Chángdào village [Cáo] Huàn was Yǔ’s son, and entered to continue the Main Clan Line.