Spurrina
Spurrina was a woman who lived in Pompeii in 79 AD. She was a member of the Sibylline Sisterhood and had breathed in molecules of dust that the Pyroviles had been releasing in the air of Pompeii. She appeared to be ranked just below the High Priestess. She was spying on Evelina, a girl about to join the Sisterhood due to the psychic powers that she had. Donna told Evelina that Vesuvius was about to erupt and kill everyone. She asked the High Priestess what she wanted to do to Donna; she wanted Donna to be sacrificed. While a Pyrovile attacked Caecilius's house she snatched Donna. Just as she was about to kill Donna, the Tenth Doctor burst in and saved her. He asked the High Priestess her true name. She eventually said it was Pyrovile. Spurrina and the other Sibylline Sisters started chanting the word.
Spurrina was killed when Vesuvius erupted. (TV: The Fires of Pompeii)
