In 79 AD, Zaccaria Innocenti made inappropriate use of the Tarantallegra spell, "conjuring a 'dance'" inside the volcano Mount Vesuvius, which possibly triggered the major eruption it had that year.
Ron Weasley forget that Io is the moon of Jupiter that has volcanoes on an Astronomy essay he wrote in 1995. Hermione Granger caught this mistake and Ron proceeded to scratch out the erroneous sentence.
- Harry Potter and the Order of the Phoenix (Mentioned only)
- Harry Potter Official Site (Mentioned only)