11th-century establishments in the Papal States

Grottaferrata () is a comune (municipality) in the Metropolitan City of Rome Capital, situated on the lower slopes of the Alban Hills, southeast of Rome. It has grown up around the Abbey of Santa Maria di Grottaferrata, founded in 1004. Nearby communes include Frascati, Rocca di Papa, Marino and Rome.

administrative apparatus of the Holy See and the central governing body of the Catholic Church

post of the State of the Church