Santa Maria del Popolo
Soon after its transfer to the prestigious Lombard Congregation Santa Maria del Popolo was reconstructed between 1472 and 1477 on the orders of Pope Sixtus IV. This was part of the ambitious urban renovation program of the pope who presented himself as "Urbis Restaurator" of Rome. The medieval church was entirely demolished and a new three-aisled, Latin cross shaped basilica was built with four identical chapels on both sides, an octagonal dome above the crossing and a tall Lombard style bell-tower at the end of the right transept. The result of this reconstruction was an early and excellent example of Italian Renaissance architecture in Rome. In spite of the many later changes the basilica essentially kept its Sistine form until today.
Santa Maria del Popolo
The dome of Santa Maria del Popolo was the first octagonal Renaissance dome above a rectangular crossing erected on a high tambour. At the time of its building in 1474-75 it had no real precedent, the only comparable examples are the drawings of Filarete for the utopist city of Sforzinda which have never been carried out. As such the dome was a visual anomaly in the skyline of Rome but later became a prototype that has many followers in the city and in other Italian towns. The raison d'être of this novelty was the miraculous icon of Madonna del Popolo that was placed right in the center of the domed sanctuary.