Genazzano's a town and a comune in the province of Rome, located on a tuff spur at 375 m over the sea level which, starting from the Monti Prenestini, ends on the Sacco River valley. History The name originates from its role as vacation resort for the ancient Roman gens Genucia. In the 11th century AD it was a fief of the Colonna family who, from their Baronal Palace (castle), controlled the road from Naples to Rome. Other It's the birthplace of Pope Martin V (Oddone Colonna). Genazzano's the n… (More on Genazzano)