Pope Clement VII, following the latter's death in 1534 Paul renewed the commission and oversaw its completion in 1541. As a cardinal, Alessandro had begun construction of the Palazzo Farnese in central Rome, and its planned size and magnificence increased upon his election to the papacy. The palace was initially designed by the architect Antonio da Sangallo the Younger, received further architectural refinement from Michelangelo, and was completed by Giacomo della Porta. Like other Farnese family buildings, the imposing palace proclaims the family's power and wealth, similarly to Alessandro's Villa Farnese at Caprarola. In 1546, after the death of Sangallo, Paul appointed the elderly Michelangelo to take supervision of the building of St. Peter's Basilica. Paul also commissioned Michelangelo to paint the 'Crucifixion of St. Peter' and the 'Conversion of St. Paul' (1542–50), his last frescoes, in the Pauline Chapel of the Vatican. Paul III's artistic and architectural commissions were numerous and varied. The Venetian artist Titian painted a portrait of the Pope in 1543, and in 1546 the well-known portrait of Paul III with his grandsons Cardinal Alessandro Farnese and Ottavio Farnese, Duke of Parma. Both are now in the Capodimonte Museum, Naples. The military fortifications in Rome and the Papal States were strengthened during his reign. He had Michelangelo relocate the ancient bronze of the Emperor Marcus Aurelius to the Capitoline Hill, where it became the centerpiece to the Piazza del Campidoglio. Other activities Society of Jesus and religious orders On 27 September 1540, Paul III formally approved the establishment of the Society of Jesus in the papal bull, Regimini militantis Ecclesiae. Originally, Paul III restricted the fledgling order to only sixty members in the bull Iniunctum nobis, however, he lifted that restriction upon seeing just how effective they were in their missionary activities. In 1548, he permitted Saint Ignatius of Loyola to print his Spiritual Exercises. Similarly, in 1540, Paul III approved the Rule of the Somaschi Fathers and on 9 June 1544 approved the Rule for the Ursulines in the bull Regimini Universalis. Consistories Throughout his papacy, Paul III elevated 71 cardinals in twelve consistories. Six of those whom he named, and later revealed publicly, were nominated "in pectore". Among those whom he named were his three immediate successors, Giovanni Maria Ciocchi del Monte (the future Pope Julius III), Marcello Cervini (the future Pope Marcellus II), and Gian Pietro Carafa (the future Pope Paul IV). Among