The impressive mosaic of "Christ in Majesty", in the apse, flanked by the "Blessed Virgin and St. John the Evangelist", survived the fire. It evokes the mosaics in the church of Monreale, Sicily. Although it is said that the mosaic was done by Cimabue, only the head of St. John was done by the artist in 1302, his last work, since he died in Pisa the same year. The cupola, at the intersection of the nave and transept, was decorated by Riminaldi showing the assumption of the Blessed Virgin.