On the side of the presbytery is the main altarpiece from the first half of the 17th century with paintings on the bench of the Annunciation and Adoration of the Shepherds, flanked by four small panels representing the Fathers of the Church, from left to right: St Augustine of Hippo, St Gregory the Great, St Ambrose of Milan and St Jerome of Stridon on which four columns Corinthian Order are supported as an allegory for the pillars of the Church.