in quibus & planissima Steganographiae a Johanne Trithemio, abbate Spanheymensi & Herbipolensi, admirandi ingenij viro, magice & aenigmatice olim conscriptae, enodatio traditur : inspersis ubique authoris ac aliorum, non contemnendis inventis Gustavus Selenus is the pseudonym for August, Duke of Braunschweig-Luneburg
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