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Located in the Prenestini hills east of Rome, it was was the area where the Roman aqueducts (Aniene Vecchia, Aniene Nuova and Acqua Marcia) from the Aniene Valley had to lose altitude to arrive with the right slope in Rome.

The country has a split personality, a “double town”: The Medieval Castle is from the Brancaccio (X sec.).  The seventeenth-century village (Borgo Pio) was built after the plague of 1656. The town owes its name to St. Gregory the Great who was the owner of these lands in the fifth century.