Mithras
From Tardis Wiki, the free Doctor Who reference
Mithras was an ancient Roman warrior. A group of heroes led by him met a Nimon scout. They managed to take the Nimon's sword and kill him with it. The encounter became a legend and the foundation of a new religion. (AUDIO: Seasons of Fear)
In Roma CI, Constantine was favored by Mithras in battle, and he became the sole god of the Roman Empire. (PROSE: Warlords of Utopia)