The Lingua Ignota — Latin for unknown language — of Hildegard von Bingen is the earliest documented invented language. The German Benedictine abbess, also Saint Hildegard (1098-1179) already had visions as a child and was therefore offered by her parents to service God in a monastery. There she would write music, books, poetry and even construct her own divine language that was written in an alphabet called litterae ignotae, containing 23 letters that she designed particularly for this language.
