From 1408 to 1418, Fra Angelico was at the Dominican friary of Cortona, where he painted frescoes, now mostly destroyed, in the Dominican Church and may have been assistant to Gherardo Starnina or a follower of his. Between 1418 and 1436 he was at the convent of Fiesole, where he also executed a number of frescoes for the church and the Altarpiece, which was deteriorated but has since been restored. A predella of the Altarpiece remains intact and is conserved in the National Gallery, London, and is a great example of Fra Angelico's ability. It shows Christ in Glory surrounded by more than 250 figures, including beatified Dominicans. In this period he painted some of his masterpieces including a version of "The Madonna of Humility", well preserved and property of the Thyssen-Bornemisza Museum but on loan to the MNAC of Barcelona, an "Annunciation" along with a "Madonna of the Pomegranate," at the Prado Museum.