The cathedral is officially the Cathedral of the Assumption of the Blessed Virgin Mary. It was first mentioned in sources in 1186. The church complex consists of a three-nave Romanesque basilica, dating from the 12th century, a Romanesque church of St. Kwiryna, patron of the diocese of Krk and the chapel of St. Barbara, an early Christian apse-baptistery and a sixteenth-century.
The temple probably existed here long before the construction of today's church - the creation of the first chapel, built on the foundations of a Roman bathhouse, is estimated in the fifth century. Over the centuries, the cathedral has been rebuilt and enlarged many times. The current building is 40 m long and 14.5 m wide. There are 9 columns and 10 arches on each side of the temple.
The most valuable works of art included in the cathedral's equipment include the marble main altar, the Gothic sculpture of the Virgin Mary, Corinthian capitals and the tombstones of the bishops of Krk. In the summer, the cathedral is also a place for cultural events, mainly concerts.