Letter Signed, as head of the Propaganda Fide, to Stephano Agem in Constantinople, about the Chintaye Mission, apparently correcting a matter concerning communication with heretics. In Italian. 1 page 9½ x 7½ inches, folds, in good condition, with the integral address leaf (torn at seal opening). Roma dalla Propaganda, 13 August 1808. Michele di Pietro (1747-1821), Cardinal, Prefect of the Congregation of Propaganda Fide, one of the most distinguished “black cardinals” (prohibited by Napoleon to wear cardinal red).