Monuments in the Basilica of Santa Maria del Popolo
The long time gap is explained by the fact that the cardinal was buried in the Old St. Peter's Basilica together with his uncle and benefactor, Cardinal Antonio Pallavicini Gentili (Antoniotto). In 1596 their bodies were relocated to the cemetery Santa Maria del Popolo where Antoniotto's monument was set up and later transferred to the Montemirabile Chapel. Philipp Zitzlsperger calls this a particularly instructive example of the separation of the body and the tomb which increasingly came to be the norm in Rome from the second half of the 16th century because the location of the cardinal's corpse has not been established but the transferral of the remains was reason enough to the relatives to erect a cenotaph in the church itself.
Santa Maria del Popolo
What is certain that the journey was connected to a feud between the Observant and the Conventual monasteries of the Augustinian Order in the Holy Roman Empire and their proposed union. According to the traditional dating Luther arrived in Rome between 25 December 1510 and January 1511. His biographer, Heinrich Böhmer assumed that the young observant friar stayed in the monastery of Santa Maria del Popolo. This assumption was disputed by newer biographers who argued that the tense relationship between the Lombardian Congregation and the administration of the Augustinian order made the monastery of Santa Maria del Popolo an unsuitable lodging for Luther who tried to win a favour at the leaders of his order. Be that as it may, Luther, who spent four weeks in Rome, certainly visited the only observant Augustinian monastery in the city and its famous pilgrimage church that was the favourite of the reigning pope.