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.
Tiberio Crispo
As papal legate to Perugia, Crispo was a "driving force behind the architectural renewal of the city". For example, in 1547 Crispo commissioned Galeazzo Alessi for the construction of Santa Maria del Popolo to replace a church demolished by the construction of the Via Nuova. He also commissioned a palace in Bolsena that bears his name, "Palazzo di Tiberio Crispo" (also known as the "Palazzo Crispo Marsciano" or "Palazzo Rondanini alla Rotonda"), which was designed by Antonio da Sangallo the Younger circa 1543; after the death of Sangallo in 1546, Raffaello da Montelupo was called in to finish the palace, which remained incomplete, however, after the deaths of both Crispo and Raffaello in 1566.