《北齐书·列传·卷十四》
及至孝昭帝驾崩，武成帝即位，拜任高元海为侍中、开府仪同三司、太子詹事。
及孝昭崩，武成即位，除元海侍中、开府仪同三司、太子詹事。
When Emperor Xiaozhao died, Emperor Wucheng ascended the throne and appointed Gao Yuanhai as shizhong (imperial attendant), Kaifu Yitong Sanshi (an official title), and Crown Prince’s teacher.