Bronze doors in the Middle Ages, in the 11th and 12th centuries, were widely used in religious buildings in Southern Italy, especially in Campania, Lazio, Apulia and Sicily. Of Roman origin, they were primarily used in Byzantine art, so much so that eight bronze doors arrived in Italy from Constantinople between 1060 and 1110. One of these is the Amalfi Cathedral, which quickly became a model for subsequent commissions. And finally, they were commissioned to decorate religious buildings in southern Italy. Barisano da Trani is among the artists who worked on three doors: for the Trani Cathedral, for the Ravello Cathedral and for the Monreal Cathedral; Bonanno Pisano worked both in Monreale, for the Cathedral, and in Pisa, for its Cathedral.