The Crucifixion, probably mid-1450s, Tempera on wood, gold ground, Shaped top, central panel, overall, with engaged frame, 18 x 11 in. (45. 7 x 27. 9 cm) ; central panel, painted surface 16 1/2 x 9 1/2 in. (41. 9 x 24. 1 cm) ; left wing, overall, with engaged frame, 18 x 5 5/8 in. (45. 7 x 14. 3 cm) ; left wing, painted surface 16 1/2 x 4 1/4 in. (41. 9 x 10. 8 cm) ; right wing, overall, with engaged frame, 18 x 5 1/4 in. (45. 7 x 13. 3 cm) ; right wing, painted surface 16 1/2 x 3 3/4 in. (41. 9 x 9. 5 cm), Paintings, Paolo Uccello (Paolo di Dono) (Italian, Florence 1397?1475 Florence), Uccello is best known for his battle scenes for the Medici palace and for frescoes in the cloister of Santa Maria Novella, Florence; however, he also painted small devotional panels. This portable triptych includes the depiction of a nun of the Brigitine order at the foot of the cross, identified by an inscription as Sister Felicity