It is the only architectural element of  medieval origin still visible. In the 17th and 18th centuries the church was renovated and expanded. The façade features a rose window and a portal with embrasure distinguished by fillets of decorated columns. At the base of the columns there are jambs decorated with bas-reliefs.
On the bas-reliefs there are animal shapes related to the Romanesque figurative culture. The rose window above has slender columns softened by foliage and other decorative motifs carved in bas-relief on the capitals.