 It was, according to Vasari, at Cosimo's urging that Fra Angelico set about the task of decorating the convent, including the magnificent fresco of the Chapter House, the often-reproduced Annunciation at the top of the stairs leading to the cells, the Maesta (or Coronation of the Madonna) with Saints (cell 9) and the many other devotional frescoes, of smaller format but remarkable luminous quality, depicting aspects of the Life of Christ that adorn the walls of each cell.In 1439 Fra Angelico completed one of his most famous works, the "San Marco Altarpiece" at Florence.The result was unusual for its time.