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The Church of St. Felicitas, now the parish church of Affile, is mentioned for the first time in the 14th century. The political centre of the town during the 14th and 15th centuries, with the universitas (town council) meeting in the adjacent square, the church has been an established reference point for the urban development of Affile and for social activities in both ancient and recent times.
Keeping in mind the general development that took place in Affile between the 10th and 13th centuries, when the area between Piazza St. Sebastiano and Porta della Valle was inhabited, which is clearly inferred by the different architectural structures visible, it is clear that the church was more or less at the centre of the medieval castrum (or fort) while the church itself is also medieval.
There are numerous relics of the famous Roman martyr saint who died on Via Salaria in the church dedicated to her. In 1827, the people of Affile added the right aisle and the chapel of St. Felicitas placing the urn with her remains under the altar.