The Fire in the Borgo is the most complex of the four episodes in the Stanza dell'Incendio di Borgo. It is full of references to classical antiquity, to medieval architecture at the time of the affirmation of the Church, and to themes used by contemporary artists. It celebrates the intercession of Leo IV, by whose grace a fire which spread through the Borgo, a popular section of Rome near the Basilica of St Peter, was extinguished. The event depicted happened in AD 847 and is documented in the "Liber Pontificalis" (a collection of early papal biographies). Pope Leo IV managed miraculously to halt the raging fire, which was threatening an area of the city, by his benediction from the loggia of Old St Peter's. The structure of the composition...