founded by Constantine, on the site where the body of the saint was
found. The aisles are formed by thirty-two columns of fine marble, and
the altar canopy is supported by four columns of porphyry. In the
second chapel on the right is a beautiful altar inlaid with mosaic
work. Pio Nono's escape when the floor fell in, April 15, 1855, is
commemorated by a fresco by Tojetti. The feast of the saint is on the
21st January, when the lambs are blessed with great ceremony. Here we
have the best idea of a basilica.