G. Vasari, Lives of the Most Excellent Painters, Sculptors, and Architects (in It. often shortened to Le Vite), 1568. Cf. full text online at STORIES FROM VASARI, "Raffaello", Ch. 183. The painting's Prado webpage states that, recently, questions have been raised as to the truthfulness of Vasari's narration of the shipwreck it suffered during its transportation. That story is considered too close to the miraculous circumstances surrounding the arrival of one of Sicily's most famous images —Trapani's Annunziata by Nino Pisano— during the Middle Ages
museodelprado.es
c. 1514 according to Penny and other sources, but the Prado says 1515-1516, Prado website