Lucius Petrus Dextrus

Lucius Petrus Dextrus (Latin "Shining Rocky Right-hand") was an augur that lived in Pompeii in 79 CE. He visited the Caecilius family on the day before the eruption of Mount Vesuvius. Under the direction of the Pyrovillians, he had an energy converter built out of marble and placed inside the heart of Mount Vesuvius in order to convert the population of the world into more Pyrovillians.

The Doctor and Caecilius' son Quintus found out that he had breathed in the dust of Mount Vesuvius, actually the remains of the Pyrovillians, which was slowly transforming him into stone. The Doctor broke his arm off and escaped, along with Quintus. Later the High Priestess ordered him to advance the prophecy, and in Mount Vesuvius he presented the energy converter to the Pyrovile. The Doctor destroyed the converter and Mount Vesuvius erupted, killing the Pyrovile and Lucius inside it, along with the rest of Pompeii.

He was involved with the Cult of Vulcan. (DW: The Fires of Pompeii)