St. Peter’s church is one of the most important churches of Leonessa also from the civil point of view.
Inside, until the end of the 17th century, the Priors swore their oath of allegiance in the presence of the Abbot of the Augustinians.
The church comprises a lower church named Santa Maria delle Grazie probably dating back to the year one thousand and an upper church built around the 15th century.
The Romanesque facade is enriched by a Gothic portal with alternating smooth and spiral small columns crowned with Corinthian capitals.
In the lunette are frescoes with Augustinian symbols.
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