- You may be looking for the volcano.
Vesuvius was a historian and the oldest surviving robot of an alternate Rome that never fell. He helped the Fourth Doctor discover the Roman "gods" were the Malevilus, and escaped the Temple of the Gods with him. He subsequently helped the Doctor start a revolution which freed Rome from the Malevilus and was rewarded by being made the new Emperor of the Galactic Roman Empire. (COMIC: Doctor Who and the Iron Legion)