In the summer of 79 A.D. (first year of the reign of the Emperor Titus, see. Dio Cassius V) Pompeii was buried by a rain of ash and lapilli (and not lava, as is often reported) that, except for an interval of a few hours, fell unbroken to form a layer of more than three meters.
The date of this eruption is known to us on the basis of a letter of Pliny the Younger, and should correspond to 24 August. However, not all scholars agree, also because of this letter there is the original, but there are only transcriptions later. In some talking about the ninth day before the Kalends of November, corresponding to the 24th of October. Other clues come from the discovery of nuts, such as walnuts and figs, or of rowan, fruit typical autumn, but the proof perhaps more important is the finding of a silver coin that says IMPXV, or the fifteenth acclamation of Titus in Emperor, which took place on September 8 in 79 AD Were found in the ash solidified cavities; these, filled with poured gypsum or other material, then formed the casts of the victims of the eruption.
In 1997 UNESCO declared Pompeii "World Heritage". The Committee has decided to promote the area whereas the extraordinary finds from the city of Pompeii, Herculaneum and neighboring cities, buried by the eruption of Vesuvius in 79 AD, are the unique testimony of a social structure preserved intact for two millennia.