The Altar of St. Jerome is decorated with a mosaic reproduction of Domenichino's famous painting of the Last communion of St. Jerome. Next to the 93-year old saint, St. Paul can be seen bending to kiss his hand; and a lion, its paws tucked under it, looks almost as if it were participating in his deep sorrow (the original canvas is in the Vatican Picture Gallery). At this point we note that most o the pictures in the basilica are mosaics, many of which are the work of P. Cristofari (whose preparatory cartoons can be found in various museums and churches).