Scuola Romana, The Prophet Amos
Fragment of fresco
Originally from the church of San Nicola in Carcere.
The label identifies this as Moses, but there are no horns and the picture itself labels the figure Amos. The quote abbreviates Amos 4:13: Quia ecce formans montes, et creans ventum, et annuntians homini eloquium suum, faciens matutinam nebulam et gradiens super excelsa terrae Dominus Deus exercituum nomen eius, "For behold he that formeth the mountains and createth the wind, and declareth his word to man, he that maketh the morning mist, and walketh upon the high places of the earth: the Lord the God of hosts is his name."
There isn't much of an iconographic tradition for Amos. In the East he is likely to have a gray or white beard like this one, sometimes forked, and hair parted in the middle. In Western images that do not follow the Eastern examples, he sometimes has a round, visorless hat, as in the 15th-century fresco at right by Melozzo da Forli.
This image in full resolution
Hat picture: Peter Geymayer via Wikimedia Commons
Main image: photographed at the Pinacoteca Vaticana by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.