Note 3 — DISSERTATION ON THE BOOK OF THE THREE IMPOSTORS.
Reading edition
Why these historical reminiscences? To sustain the conjecture that it was to this Otho the Illustrious that this copy of the pamphlet of the Three Impostors was addressed. By whom? This is why we are led to believe that the F. I. s. d. which follows L’amico meo carissimo, and which we interpret FREDERICUS. Imperator salutem Domino. Thus this would be by The Emperor Frederick II., son of Henry IV. and grandson of Frederick Barbarossa, who, succeeding to their Empire, had at the same time inherited the hatred of the Roman Pontiffs.3