NOTES: Originally attributed to Giacomo Barozzi da Vignola after a design by Michelangelo, the Porta del Popolo was in fact designed by the Florentine architect known as Nanni di Baccio Bigio (born Giovanni Lippi) in 1562. This drawing is derived from Giacomo Barozzi da Vignola. Regola delli cinque ordini d'architettura (Rome, 1617?), pl. 38 and 39
NOTES: This drawing is numbered XII/1 in the Burlington-Devonshire Collection. The top half of the drawing shows the Arch of Septimius Severus, built around 203 AD and the bottom half depicts the Arch of Janus, built in the 4th century AD.