A Roman Catholic cathedral located in the Istrian town of Poreč in Croatia. It is a great example of Byzantine architecture in the Mediterranean region, and the church has preserved its original structure despite accidents, fires and earthquakes that changed some of its architectural details. The church is famous for its mosaic floor, which dates back to the fifth century; Which has been included in the UNESCO World Heritage List since 1997. The cathedral is located within the bishop's complex, which houses many ancient buildings, including the clock tower and the Archbishop's Palace.