《北史·列传·卷七》
当侯景南奔梁时，梁武帝封贞为咸阳王，把他送到侯景那里，让他当北魏国君。
及侯景南奔，梁武以贞为咸阳王。送景，使为魏主。
When Hou Jing went south to Liang, Emperor Wu of Liang made Zhen Prince of Xianyang and sent him to Hou Jing as ruler of the Northern Wei Dynasty.