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.
Italian Baroque
In 1605, at the very beginning of his pontificate, Pope Paul V commissioned Carlo Maderno to redesign St. Peter's Basilica. It was at the age of 72, in 1546, when Michelangelo first took hold of the unfinished rebuilding project started by Bramante. When Michelangelo died, the construction of the, then, Greek-cross section surrounding the Papal altar and the tomb of Peter had been completed only as far as the top of the drum. The dome then became completed, with some modifications, by Giacomo della Porta in 1590. It was the continuous debates over the religious and aesthetic benefits of keeping the Greek-cross plan or enhancing the space by extending it into Latin-cross plan that led Paul V to boldly commission for Maderno's services. Maderno's initial projects, including the long nave addition, which created a new Latin-Cross solution upon the ground plan, the façade and the portico, became an instantly recognizable image of Rome and the heart and spirit of Catholic Christianity.