Francis, Duke of Guise
Desceliers was also an examiner of Maritime Pilots and was authorised to award patents on behalf of the French king, as evidenced by the seal found bearing his initials. He probably also taught hydrography. He made a hydrographic chart of the coast of France for Francis, Duke of Guise. Nothing is known of his life after the creation of the 1553 map; the "Dictionnaire de biographie française" suggests that he died after 1574, but none of its sources support this statement.