Chronology of Catholic Dioceses:Notes on the Diocese of Fidene 502

About Fidene (now Castel Giubileo), there are two versions.

1. The only notice about a diocese is from 502. At a Council in Rome we have a Gerenzio as bishop of Fidenae. The town became uninhabited during the VIII century and the diocese was abandoned.
http://www.comune.roma.it/circoscr/IV/castelgiubileo/index1.htm (Comune di Roma website, page no longer available)

3. The second version based on the most recent historic researches: Fidene has never been a diocese and Gerenzio wasn't bishop there.
Source: L. Quilici, S. Quilici Gigli, Fidenae, C.N.R., Roma 1986, pp.434-435. (L. Quilici kindly wrote to me.)

Today, Fidene is a quarter of Rome.

-Giulio Longo