A primo pensiero for the mosaic of Saint Athanasius for one of the pendentives of the Cappella Clementina in Saint Peter's, Rome, I. Chiappini di Sorio, Cristoforo Roncalli, detto il Pomerancio, in Il Pittore Bergamaschi, il Seicento, Bergamo, 1983, I, illustrated p. 165. The preparatory studies were supplied by Roncalli in 1599 and the mosaics were completed by 1601. The black chalk modelli for the pendentives of the Four Fathers of the Latin Church are at Chatsworth, see M. Jaffé, Old Master Drawings from Chatsworth, Virginia, 1987, no. 58, one illustrated