Roman emperor had his own mother killed was none other than the famous "Nero" who ruled from 56 to 68 AD. He never trusted hi mother and had tried to kill her once before but failed and finally ordered her killing. He also killed his first wife and then the second one when she was pregnant.
Once he saw a slave boy who resembled his wife and
liked him, he had him castrated and forced him to dress like women and married
him.