Jules MAZARIN (1602–1661). Autograph letter with the handwritten greeting “Hummo devotmo et obbmo serve GiulMazarini,” Rome, February 29, 1638, to a Royal Highness; 1 folio page; in Italian. A letter accompanying the delivery of a cipher (“congiunta cifra”), assuring the recipient of his devotion. Former collection of Maurizio Seyssel of Aix. Enclosed is a contemporary copy of two letters from Mazarin in Italian (Vincennes, March 6, 1661).