From the Mazza collection comes a small masterpiece of plastic art by Alessandro Algardi, a famous Baroque sculptor of Bolognese origin and of Roman training. The artist's poetics can be recognized in the characteristic drapery, with large wavy surfaces, which create effects of brightness and softness. Another stylistic feature is the torsion of the elongated and agile bust, a sign of a strong sense of volume and space. Some details, such as the lion's head in the sword handle or the medusa's head in the lorica, are modeled with accuracy; others, such as the belt, are barely mentioned. The terracotta, in fact, was not born as a work in itself, but as a preparatory model for the reproduction of Attila in the marble altar of St. Peter's Basilica, depicting the meeting of Pope Leo I and Attila (1646-1653).