In November 2010, American art historian Roy Doliner claimed that a restored 12-inch statue from the late 15th century is a long-misidentified Michelangelo piece that served as the test run for his Pietà. The small sculpture of Mary and Jesus was previously attributed to celebrated 15th century sculptor Andrea Bregno. But Doliner believes this piece was a sort of proof of concept given to cardinal de Billheres to secure the commission.