The adherents of Sangallo resented it very naturally, and the "Setta Sangallesca" became his bitter enemies.

The Pope himself was dissatisfied with Sangallo, and the design for the cornice was thrown open to competition.

Perino del Vaga, Sebastiano del Piombo, Giorgio Vasari, and Michael Angelo all competed.

Michael Angelo's design was eventually carried out after he had placed a wooden model of part of his cornice in position.

Vasari, who is the best authority upon this period of the life of Michael Angelo, attributes to him also the exterior of the palace from the second story upwards, and the whole of the central courtyard above the first story, "making it the finest thing of its sort in Europe." Michael Angelo had also a serious disagreement with Sangallo before the military committee fortifying the Borgo for the Pope.
When Antonio da Sangallo died at Terni on October 3, 1546, Michael Angelo succeeded to his post in Rome, architect-in-general to the Pope, the principal work was, of course, the great Church of St.Peter's.