The Bishop of porto is a village of medieval origin, of which the crenellated walls and the original door on the coat of arms is placed by PAPA Sixtus IV che nel 1483, fece restaurare le mura.

Il borgo doveva ospitare la sede vescovile di Porto e Santa Rufina, ma ebbe anche una funzione difensiva dalle incursioni barbariche e saracene nel corso del medioevo dopo l’abbandono della città di Porto, borgo che prendeva il nome dalla sua posizione, a ridosso del tratto del Tevere che va a sfociare nel mare.

In the 11th century PAPA Benedict III He made it a military garrison and was fortified during the next century and again in the 16th century, assuming the aspect that still maintains.
Within the Bishop's residence is the Church of Sant'Ippolito e Lucia, where the relics of the patron saint of Fiumicino.

The port was an important spiritual Center to accommodate many Cardinals, and future Popes: Rodrigo Borgia (1476), future Pope Alexander VI; Gian Pietro Carafa (1553), future Pope Paul IV; Alessandro Farnese (1578); Fulvio Giulio della Corgna (1580); Ulderico Carpegna (1675) who left a legacy to address the cost of missions to be held every four years; Pietro Ottoboni (1687), future Pope Alexander VIII; Flavio Chigi (1693) which expanded and embellished the Cathedral; Vincenzo Maria Orsini (1715), future Pope Benedict XIII; Bartolomeo Pacca (1821).

Legend has it that St. Peter landed on the banks of the Tiber near the port before starting his journey to Rome. The mystery remains: is it true?