The mosaics that were here at the time of the fire were moved to the arch over the apse. The present ones were made between 1854 and 1874 by Vatican workshops, based on designs by Filippo Agricola and Nicola Consoni. In the tympanum of the pediment Christ between the Apostles Peter and Paul. Below is the Lamb of God on the mountain of Paradise. The four rivers flowing from it symbolize the gospels, and the twelve lambs drinking from the rivers symbolize the Apostles. The cities are Jerusalem and Bethlehem. The lowest section shows the Old Testament Prophets Isaiah, Jeremiah, Ezekiel and Daniel and these figures are separated by three large arched windows.