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WI, due to meteorological butterflies caused by human action (let's say, during a training session, a Roman legionnaire overshoots his target ITTL, leaving his pilum stuck high in a tree. A few days later, this conductor attracts a lightning strike, starting a local fire which is large enough to have a significant impact on weather patterns a month down the line), the prevailing wind in Campania happens to be blowing toward the west instead of the south east at the time of the eruption of Mt Vesuvius on August 24th & 25th, 79AD? As such, the town of Pompeii is largely spared, and the town of Neapolis (which would IOTL later become the city of Naples) is destroyed and buried by the eruption instead. What happens afterwards?

ATL Vesuvius Eruption.jpg
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