Velletri is an Italian comune in the Metropolitan City of Rome, approximately 40 km to the southeast of the city centre, located in the Alban Hills, in the region of Lazio, central Italy. Neighbouring communes are Rocca di Papa, Lariano, Cisterna di Latina, Artena, Aprilia, Nemi, Genzano di Roma, and Lanuvio. Its motto is: Est mihi libertas papalis et imperialis.

Metropolitan City of Rome Capital is an area of local government at the level of metropolitan city in the Lazio region of Italy. It comprises the territory of the city of Rome and 120 other comuni in the hinterland of the city. With more than 4.3 million inhabitants, it is the largest metropolitan city in Italy.