"Il Vero Volto di Leone XII", the exhibition opened Saturday, May 18, 2013 in Fabriano, near the Pinacoteca civica "Bruno Molajoli". Following the request by the organisers, the Gianfranco Fedrigoni Foundation, European Institute of the History of Paper and Paper Sciences has collaborated, bringing technical and scientific support to the initiative. In fact, at the show a letter was presented written on a sheet of paper watermarked with the coat of arms and the portrait of the Pope, produced in 1824 by Cartiere Miliani. The research carried out by the Foundation, at the Historical Archives of Cartiere Miliani Fabriano, revealed that the paper was donated by Miliani to the Pope, who greatly appreciated the initiative, he reciprocated the gift with a medal and authorised the production of paper. Gianfranco Fedrigoni Foundation has produced - thanks to the collaboration of the Reparto Filigranisti della FABRIANO Fedrigoni S.p.A. - a high-resolution scan of the sheet and the detection of the watermark.