Rio, perversely bent on stigmatising whatever in Italian art savours of the Renaissance, depreciates this lovely form of Peace. L'Art Chrétien, vol. i. p. 57.
See Muratori, vol. xxiii., or the passage translated by me in Vol. I., Age of the Despots, p. 480.
His "Madonna" in S. Domenico is dated 1221. For a full discussion of Guido da Siena's date, see Crowe and Cavalcaselle, vol. i. pp. 180-185.