Eureka! I think I've found a patroness saint for cryptographers: St. Hildegard von Bingen!
She invented her own cipher alphabet!:
It appears to be a basic substitution cipher.
From The Codebreakers:
Hildegard von Bingen, an 11th-century nun who saw apocalyptic visions and was later canonized, had a cipher alphabet which she claimed came to her in a flash of inspiration."Some say her nuns used the Lingua to share secrets unknown to anyone outside the walls of their convent." (source).
Raymond Lully, T.O.S.F. (1232-1315) (mentioned in the excellent history-of-logic article: "The Scholastics' Neglected Heritage", unabridged version: "L’héritage négligé des scolastiques: pensée et désignation avant l’essor de la logique post-aristotélicienne") later devised a method of polyalphabetic substitution.
St. Hildegard's researches into botany (see this translated excerpt of her Physica) and cosmology (see ch. 12 of Sungenis's Galileo Was Wrong vol. 2 PDF p. 463f., which includes exclusive translations from German of St. Hildegard; cf. The Principle documentary.) are impressive, as is the music she composed.
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