Anton Raphael MENGS (1728-1779). L.A.S., Madrid December 9, 1776, to a public prosecutor; 1page in-4; in Italian. Rare letter at the end of his stay in Madrid (where he is completing his decoration of the royal palace). He has had an expert from the Nunciature draw up the letter of proxy that H.E. Prince Doria requested, and asks that it be brought to the Prince with his humble compliments, begging him on his behalf for the execution of this grace, for which he will profess the most constant obligations...