The central hall of the Episcopal Palace from the 6th c. – built as the ceremonial, throne and reception room and used by Bishop Euphrasius for governing both the diocese and the city of Parentium. The space has preserved its original architectural characteristics and the details of its furnishing surprisingly well.
It is an almost perfect cube, complemented by a spacious semi-circular apse to the north. The main area is lit through windows installed to the very top of its walls. One of them contains a stone transenna, preserved in situ. This is the only preserved Early Christian ceremonial hall in the world.