The title of your 1580 book is "F. Ioan. Duns Scoti, Ordinis Minorum, Theologorum Omnium Eminentissimi, Atque Academiae Subtilium Antesignani, Quaestiones Quarti Voluminis Scripti Oxoniensis Super Sententias" which translates to "F. Ioan. Duns Scotus, of the Order of Friars Minor, to all theologians of the Most Eminent, and also Academy of Subtilium though the leading reformers, on the View of Oxford Questions the Fourth Volume To be written"
John Duns Scotus was a 13th century philosopher on Catholic Doctrine.
Your 16th century book with tooled leather binding was printed on 'laid paper' (not papryus) in Venice by Apud Haeredes Melchioris Sessae, or the heirs of Melchior Sessa. The estimate is based on prices of matches to this printing.