Cao Teng

Cao Teng, courtesy name Jixing, was a eunuch who lived during the Eastern Han dynasty of China. He served four Han emperors. Through his adopted son Cao Song, he was the grandfather of Cao Cao, who laid the foundations for the state of Cao Wei in the Three Kingdoms period. On 3 August 229, during the reign of Cao Cao's grandson Cao Rui, Cao Teng was posthumously honoured as "Emperor Gao of Wei" (魏高帝), becoming the only eunuch in Chinese officialdom to have this honor.