Who is Tiberius from The Forgotten Daughter and what is their importance?

Tiberius is the conservative and traditional Roman Senator who is at once both loved by the people and despised by the Senate. Tiberius makes enemies quickly of those he seeks to undo, mainly the rich elites who have stolen land from the poor Roman family farmers -land which Tiberius wants returned. Aulus befriends and defends Tiberius when the Senate conspires to kill him. Tiberius is, ultimately, assassinated by a Senatorial conspiracy.