Your father was an artificer of renown in Calleva Atrebatus. He had dealings, as all artificers do, with unsavory types looking to sell what they have stolen or killed to acquire. These elements are then used to create magical works of art. For the wealth he carried, your father was killed by Nestorius of the Collegia Gallorum. The local prefect has ignored this murder, for whatever reason, and cannot be trusted. This foul act cannot go unavenged.