The Via dei Pettinari retraces the route of an ancient path which starts from the Pons Aurelius and headed towards the Theatre of Pompey. A church at the site was present by the 12th century, and is mentioned in a bull by Pope Honorius II in 1127. It was dedicated under the title "Transfiguration of our Lord Jesus Christ". The Transfiguration was depicted in the apse by Filippo Prosperi. Between the windows, in each of the eight quadrants divided by pilasters on the dark red wall, Prósperi also frescoed, on gold, saints and patriarchs of the Old Testament that foreshadowed the Savior. The suffix in onda derives from the frequent floods (inondazione) of the district by the Tiber river."Church of San Salvatore in Onda", Catholic Apostolate Center
