The Church of St Michael the Archangel is among the oldest in the town. It was likely built at the dawn of the 11th century and is dedicated to the Archangel Michael. By 1169 it already appears in written records, and in 1297 the Annibaldi family transferred ownership to the Caetani. According to tradition, the church was built atop the ruins of an ancient pagan temple devoted to the goddess Maia. Like many churches in Sermoneta, it has been shaped by centuries of alterations, resulting today in a captivating blend of architectural styles and eras. Inside, its irregular floor plan unfolds across three naves. The vaulted ceilings and arched nave openings reflect the elegant lines of Gothic architecture. Particular highlights include the 18th-century organ and the baptistery from 1603. From the left nave, a staircase leads down to the 12th-century crypt, whose walls were painted across different periods. Here, one can admire depictions of Saints Peter and John the Baptist, Saint Blaise, Saint Catherine of Alexandria, the Virgin Mary, the Annunciation, and Saint Catherine.
During restoration, a rare acoustic opening was discovered in the vault — a feature designed to carry the sound of liturgical services and music from the crypt to the upper nave. Finally, on the back wall of the Battenti Chapel, a striking fresco portrays the entire Crucifixion scene. Christ stands at the centre, flanked by the two thieves, while the Virgin Mary, Mary Magdalene, Saint Lucy, and Saint John stand witness. In the distance rises the city of Jerusalem, illuminated by the sun and moon suspended in the sky.
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