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umanesimo:

Litterae Ignotae, 12th century. 
Hildegard of Bingen’s alternative alphabet from a manuscript, which she used for her language Lingua Ignota

via brooklyn museum

A Lingua Ignota (Latin for “unknown language”) was described by the 12th century abbess of Rupertsberg, Hildegard of Bingen, who apparently used it for mystical purposes. To write it, she used an alphabet of 23 letters, the litterae ignotae.

[…]

The purpose of Lingua Ignota is unknown; nor do we know who besides its creator was familiar with it. In the 19th century some believed that Hildegard intended her language to be an ideal, universal language. However, nowadays it is generally assumed that Lingua Ignota was devised as a secret language; like Hildegard’s “unheard music”, it would have come to her by divine inspiration. Inasmuch as the language was constructed by Hildegard, it may be considered one of the earliest known constructed languages.

via wikipedia