The cathedral complex in Poreč is one of the best-preserved complexes of early Christian architecture in the world. It was named after Bishop Euphrasius who had the then existing 5th century basilica, built on the site of an earlier 4th century church, refurbished. Bishop Euphrasius furnished the new basilica with the opulent mosaic, built the atrium with a four-sided portico next to the baptistery, as well as the diocesan building and the memorial chapel. He made his investment immortal by carving an inscription spanning the central apse of the cathedral.
The Basilica has been inscribed on the UNESCO World Heritage List since 1997.