Dome

Detail, showing Constantine and a city gate; The buildings around the basilica underwent major restructuring in the 13th century. In particular, the cardinal's residence was enlarged by cardinal Stefano Conti, a nephew of Pope Innocent III. He built a massive fortified structure on the north side of the basilica, on the ground floor of which is the chapel of St Sylvester that was consecrated in 1247 and contains interesting frescoes depicting the story of Pope Sylvester and the Emperor Constantine. Source: Santi Quatto Coronati Monastery [website]; http://www.santiquattrocoronati.org/ (accessed 1/20/2008)