“From approximately 1563 to 1566 Della Porta travels to other parts of Italy, France and Spain, collecting secrets and meeting with learned men. Indeed he presented to Philip II his book on ciphers De Furtivis Literarum Notis (1563). The second edition of his Magia Naturalis (1561) also contains a brief dedication to the Spanish Philip”
Text from Wikiquote, available under CC BY-SA 4.0.
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