At each extremity of this portal, rise two insulated towers, receding from all the projection of the inferior order, and decorated by Corinthian columns with pilasters, on an attic serving as a socle.
"Paris As It Was and As It Is"
Francis W. Blagdon
On the socle is Charlemagne, by Polidoro da Caravaggio.
"Walks in Rome"
Augustus J.C. Hare