The Euphrasian Basilica is a basilica in Poreč, Croatia. The episcopal complex, including, apart the basilica itself, a sacristy, a baptistery and the bell tower of the nearby archbishop's palace, is one of the best examples of early Byzantine architecture in the Mediterranean region. The Euphrasian basilica has for the most part retained its original shape, but accidents, fires and earthquakes have altered a few details.
Since it is the third church to be built on the same site, it conceals previous buildings, for example the great floor mosaic of the previous basilica from the 5th century. Because of its exceptional value, it has been inscribed on the UNESCO World Heritage List since 1997.
The earliest basilica was dedicated to Saint Maurus of Parentium and dates back to the second half of the 4th century. The floor mosaic from its oratory, originally part of a large Roman house, is still preserved in the church garden. This oratorium was already expanded in the same century into a church composed of a nave and one aisle (basilicae geminae). The fish (symbol of Christ) on the floor mosaic dates from this period. Coins with the portrayal of emperor Valens (365–378), found in the same spot, confirm these dates.
The present basilica, dedicated to the Virgin Mary, was built in the sixth century during the period of Bishop Euphrasius. It was built from 553 on the site of the older basilica that had become dilapidated. For the construction, parts of the former church were used and the marble blocks were imported from the coast of the Sea of Marmara. The wall mosaics were executed by Byzantian masters and the floor mosaics by local experts. The construction took about ten years. Euphrasius, holding the church in his arms, is represented on one of the mosaics on the apse, next to St. Maurus.
The most striking feature of the basilica are its mosaics, dating from the 6th century, and which are considered amongst the finest examples of Byzantine art in the world. The mosaics in the triumphal arch over the apse represent Christ; holding an opened book with the text "Ego sum Lux vera" (I am the true light) with the Apostles, each with their attribute, The arch below contains mosaic medallions with the Lamb of God and portraits of twelve female martyrs. The vault over the apse is decorated with mosaics with Mary and Child, sitting on the Heavenly throne, under a wreath held by a hand - symbol of God the Father.
This is the only surviving depiction of the Mother of God in an early-Christian western basilica. She is flanked by angels, Bishop Euphrasius, holding the model of the church; also local saints are depicted, including St. Maurus, the first bishop of Poreč and the Istrian diocese, and the archdeacon Claudius . The child between Euphrasius and Claudius is accompanied by the inscription "Euphrasius, son of the archdeacon". All figures stand on a meadow covered with flowers.
The apsis is dominated by the marble ciborium, modelled after the one in St. Mark's in Venice, it was built in 1277 on the orders of by Otto, Bishop of Poreč. The canopy, decorated with mosaics, is carried by four marble columns that belonged to the previous 6th-century ciborium. The front side of the canopy depicts representations of scenes from Mary's life, the Annunciation. In the 15th century Bishop Johann Porečanin ordered in Italy a Renaissance relief for the antependium of the altar, made of gilded silver. The polyptych of the Venetian painter Antonio Vivarini dates from the same period. The Last Supper, painted by Palma the Younger is a Baroque work.
The basilica is part of a complex composed of:
- A 6th-century octagonal baptistry. Built in the 5th century together with the pre-Euphrasian basilica, and underwent considerable alterations.
- A 16th-century bell tower (16th century).
- A colonnaded atrium. Built after the basilica, it is covered on all four sides by a portico which houses a rich collection of stone monuments.
- An Episcopal 6th-century residence (The Bishop's Palace), also built in the 6th century. Very little remains of the original building.
- A trefoil-shaped memorial chapel, built in the 17th and 19th centuries.