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 reconstruction also had a symbolic message that the evil walnut tree of Nero was supplanted by the beneficent oak of the Della Rovere. The papal coats of arms were placed on the façade and the vaults as "symbols of eternal happiness and protection from lightning", as Landucci explained praising the transposition of the two trees. Another important aspect of the Sistine reconstruction was that it made the basilica – the first church for the pilgrims arriving in Rome from the North – a dynastic monument of the Della Rovere family. This was reinforced by relatives of the pope and other personages of his court who bought chapels and built funeral monuments. "Santa Maria del Popolo became a place to unite visually the universal domination of the church with the della Rovere, a totemic symbol that would associate the della Rovere with Rome and allowed them to co-opt its magnificience and glory", claimed Lisa Passaglia Bauman.