宇文護
In spring 558, Emperor Ming created his wife Duchess Dugu the title of princess (as he was still using the Heavenly Prince title at this point). Three months later, however, she died. (The historian Bo Yang speculated that because Yuwen Hu had in 557 forced her father Dugu Xin to commit suicide after Dugu Xin was implicated in a plot to overthrow Yuwen Hu, that Yuwen Hu had her murdered, but had no concrete evidence to show that that happened.)