Magnus

Magnus (d. 44 BCE) was a Roman Orator and a supporter of Julius Caesar.

As he was doing a public speach supporting the ascension of Caesar to dictatorship, Magnus was targeted by the Hidden Ones. From a nearby roof where she was listening with Brutus, Amunet shot an arrow into the back of the orator's skull to send a message to Caesar.

Reference

 * Assassin's Creed: Origins