Polyptych of the Misericordia (or Virginn of the Mercy), by Pietro di Benedetto dei Franceschi known as Piero della Francesca, 1454 about, 15th Century, tempera and oil on canvas, cm 273 x 323 . Italy, Tuscany, Arezzo, Borgo Sansepolcro, Municipal Picture Gallery. Detail. Side compartment to the right, face and torso of St Bernardine of Siena after the restoration carried out by the Central Institute of Restoration in Rome, 109x45 cm.