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In page Tre Taverne:

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Around the 3rd century AD, the area was invaded by marshes, and the inhabitants of the nearby Ulubrae likely moved to Tres Tabernae, which grew of importance and became a Christian episcopal see with a Palaeo-Christian cathedral dedicated to St. Paul.[3] In 307, emperor Flavius Severus was assassinated (or forced to commit suicide) here by Heraclius, by order of other emperors Maximian and Maxentius. The barbaric invasions in Italy caused a further expansions of the marshes, and Tres Tabernae declined so that, in 592, Pope Gregory I united its diocese to that of Velletri. Later in the high Middle Ages, Tres Tabernae was ravaged several times by the Saracens, until it was completely destroyed in 868.[citation needed]