It is not fair, Cimon. The point of a trivia thread is to give other people a chance to answer and to ask the next question. I am sure you meant well but others (myself included) could have answered the question.

According to the rules, we should now have to wait for your return and your next question. But since that was not your intent, I'll ask the next one myself - and hope someone answers before you come back ;-)

Here: who was the magistrate, Caesar's relative by marriage, who was involved in his murder and whose identity led to the subsequent murder, by mistake, of a friend of Caesar's?