79

On 23rd August 79, the Tenth Doctor and Donna Noble accidentally arrived in Pompeii; the Doctor had been trying to land in Rome. The following day, the Doctor caused Mount Vesuvius to erupt in order to kill all the Pyrovile. The whole population of Pompeii was wiped out, bar one family. (DW: The Fires of Pompeii)

Earlier on 24th August 79, the Seventh Doctor and Melanie Bush likewise arrived in Pompeii and witnessed the eruption of Mount Vesuvius. The Seventh Doctor remained completely ignorant of the presence of both his future self and the Pyrovile in the city. (BFA: The Fires of Vulcan)

These two incarnations of the Doctor were not the only time travellers in Pompeii on 24th August 79 as the 51st century ex-Time Agent Jack Harkness, a future companion of the Ninth and Tenth Doctors, was present for the eruption, apparently more than once. (DW: The Doctor Dances)