The Diocese of Frascati (Lat.: Tusculana) is a Latin suburbicarian see of the Diocese of Rome and a diocese of the Catholic Church in Italy, based at Frascati, near Rome. The bishop of Frascati is a Cardinal Bishop; from the Latin name of the area, the bishop has also been called Bishop of Tusculum. Tusculum was destroyed in 1191. The bishopric moved from Tusculum to Frascati, a nearby town which is first mentioned in the pontificate of Pope Leo IV. Until 1962, the Cardinal-Bishop was concurrently the diocesan bishop of the see. Pope John XXIII removed the Cardinal Bishops from any actual responsibility in their suburbicarian dioceses and made the title purely honorific.

Relationships during the 17th century

Like other dioceses close to Rome, Frascati became a bishopric of choice for Cardinals of powerful papal families during the 17th century; a period known for its unabashed nepotism. Frascati Bishops of that era were significantly intertwined:

Bishops

To 1200

Bishops of Labico

Bishops of Tusculum

1200–1400

Bishops of Frascati

1400–1600

1600–1800

From 1800

From 1900

From 1962

Auxiliary bishops

Books

Studies