|“||You either die a hero, or you live long enough to see yourself become the villain.||”|
— Matheus to his daughter Sienna
Matheus is first seen when his daughter Sienna receives a phone call from him. He and his wife are in Sicily and that he plans on spending a few more weeks there before trailing off. Knowing her father, she asks what he wants and he says he wanted her to dig up information on the Moores before hanging up. It is revealed that her parents treat her like they don't want her, making her feel like they'd choose Erin over her, given the chance.
In present day, he is one of the many followers of Agoroth that is Caen, the church of Saint-Etienne-le-Vieux in France. He is told by Agoroth to continue playing both sides and push his daughter, Sienna closer to O.R.B.S.