Pope Sergius I
Pope Sergius I restored it at the end of the 7th century, but Pope Leo III, the fourth pope who had been pastor of this church, rebuilt it from the ground in 796, adding the great apse and conserving the relics of the saints in the crypt. A vast mosaic of Christ flanked by Leo and the Emperor Charlemagne, and Saints Susanna and Felicity on the other side, was so badly damaged in the 12th century by an earthquake that the interior was plastered over in the complete renovation that spanned the years 1585–1602, and frescoed by Cesare Nebbia.