A lingua ignota (Latin for "unknown language") was described by the 12th century abbess of Rupertsberg St. Hildegard of Bingen, OSB, who apparently used it for mystical purposes. It consists of vocabulary with no known grammar; the only known text is individual words embedded in Latin. To write it, Hildegard used an alphabet of 23 letters denominated litterae ignotae. History St. Hildegard partially described the language in a work titled Ignota lingua per simplicem hominem Hildegardem prolata, which survived in two manuscripts, both dating to ca. 1200, the Wiesbaden Codex and a Berlin MS (Lat. Quart. 4º 674), previously Codex Cheltenhamensis 9303, collected by Sir Thomas Phillipps. The text is a glossary of 1011 words in Lingua ignota, with glosses mostly in Latin, sometimes in Middle High German; the words appear to be a priori coinages, mostly nouns with a few adjectives. Grammatically it appears to be a partial relexification of Latin, that is, a language formed by substituting new vocabulary into an existing grammar.<ref>Barbara Jean Jeskalian, Hildegard of Bingen: the creative dimensions of a Medieval personality." Graduate Theological Union</ref> The purpose of Lingua ignota is unknown, and it is not known 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, in the 21st century it is assumed that Lingua ignota was devised as a secret language; like Hildegard's "unheard music", she would have attributed it to divine inspiration. To the extent that the language was constructed by Hildegard, it may be considered one of the earliest known constructed languages. In a letter to Hildegard, her friend and provost Wolmarus, fearing that Hildegard would soon die, asks ubi tunc vox inauditae melodiae? et vox inauditae linguae? (Descemet, p. 346; "where, then, the voice of the unheard melody? And the voice of the unheard language?"), suggesting that the existence of Hildegard's language was known, but there were no initiates who would have preserved its knowledge after her death. Sample text The only extant text in the language is the following short passage: These two sentences are written mostly in Latin with five key words in Lingua ignota; as only one of these is unambiguously found in the glossary (, "people"), it is clear that the vocabulary was larger than 1011 words. (Higley 2007 finds probable correspondences for two other words.) "O Ecclesia, girded with