Collevecchio borders the following municipalities: Civita Castellana (VT), Magliano Sabina, Montebuono, Ponzano Romano (RM), Stimigliano, Tarano.
Historians (such as Christopher Hibbert) believe he had been born to a mulatto servant who was working in the Medici household, identified in documents as Simonetta da Collevecchio.
Magliano Sabina borders the following municipalities: Calvi dell'Umbria, Civita Castellana, Collevecchio, Gallese, Montebuono, Orte, Otricoli.