The lead and infobox uses "Pyrovilia", but almost everywhere else uses "Pyrovillia". Which is the confirmed spelling?
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Pyrovillia was the home planet of the Pyroviles, a species of rock-based humanoids. (TV: The Fires of Pompeii)
History
Pyrovillia was one of the 27 stolen planets the Daleks transported to the Medusa Cascade, and one of only three planets in this operation that were not taken from 2009. It was, instead, taken more than two thousand years earlier.
By 2009, the disappearance of Pyrovillia was considered a cold case by the Shadow Proclamation. However, the Tenth Doctor and his companion Donna Noble factored in that while 24 other worlds had been stolen simultaneously, this one could have been taken from another time. It was then discovered by the Doctor that the planet was stolen by the Daleks and put in the Medusa Cascade along with twenty-six other worlds, including Adipose 3 and the lost moon of Poosh, which, like Pyrovillia, also went missing earlier to the mass planet disappearances. (TV: The Stolen Earth) After Donna had defeated the Daleks, she was able to reverse the disappearance and send it back to its proper location. (TV: Journey's End)
Jack Harkness claimed the Icelandic race were of alien origin, possibly from the vicinity of Pyrovillia. They had crashed on Earth while investigating the volcanoes of Iceland. (AUDIO: The Sin Eaters)