the façade in white stone dates from the 14th century. the portal has capitals with the four evangelists (left) and the adoration of the magi (right), and is surmounted by a circular window which in 1915 replaced the original rose window. the interior dates mostly from the 18th-century renovation, although the original 13th-century structure has survived in the apse exterior, in the presbytery and the clergy house. it houses 14th- and 15th-century frescoes and statues of st. peter and st. marcian.