Nuceria is a town near Pompeii, and also their main rival. It was presumably destroyed when Mount Vesuvius erupted.
Regulus wanted to host a show for the Nucerians and the Pompeiians, and due to the Nucerians not having a stadium, they went to Pompeii. After a gladiator show that disappointed the Pompeiians, they took out their swords and killed the Nucerians.
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