 It has cycle of frescoes with "Christ between the Symbols of the Evangelists", the "Adoration of the Magii", a "Dead Man in Red Toga" and "Contrast between Three Dead and Three Living Men", the latter perhaps a representation of the legend of Charlemagne.Today the interior of the church has only the nave and one aisle, as the right aisle was annexed to the cloister.Two apses are present, the right one having been eliminated to build the Capitular Hall.