Dedicated to Saints John and Paul, the cathedral of the city of Muggia was consecrated in 1263 but completed only in 1467, under Venetian domination.
The façade is original: very white thanks to the stone of the Carso coming from the quarries of Aurisina, it is trilobate, made in Gothic style, with a large rose window in the middle with sixteen arches containing a Madonna with Child.
Three epigraphs surround it: the one on the right mentions podestà Pietro Dandolo (1466-1467), who supervised the completion of the work, the one on the left recalls the restoration of 1865 and the one above the beginning of work on the façade under Bishop Nicolò.Between the rose window and the portal there is a large lunette that contains a bas-relief depicting the Trinity flanked by Saints John and Paul, to whom the sacred building is dedicated.
The interior, divided into three naves, separated by four round arches and a trussed roof, underwent substantial consolidation and restoration at the end of 1930, including the removal of the Baroque side altars. A fragment of the 14th century fresco that occupied the nave remains. The cathedral treasury preserves some silver work.
The bell tower is in Venetian style, with a square base and octagonal spire.
