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The central pictorial motif in the choir cupola is a half-figure of Christus Emmanuel (Messias, God with us) against a starry sky and framed by an aureole. The Virgin and thirteen prophets posed as orants radiate out from it. The texts displayed on inscription ribbons by the prophets herald the coming of the Saviour. The symbols of the evangelists appear in the four pendentives below.
The mosaics in the cupola are variously dated from the early to the late twelfth century. The figure of Christus Emmanuel was restored in the fifteenth century.
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