Returning to Rome, Michetti was inducted into the Accademia di San Luca in 1725 and appointed architect of the Apostolic Chamber and of the Theatine Order.
In 1644 it was renamed Quai des Théatins after some Theatines built a monastery on the quai (Today located at No. 23 and No. 25 Quai Voltaire).
Saint Cajetan (1480–1547), Catholic saint and the founder of the order of the Clerics Regular, better known as the Theatines