Hildegard's fellow nuns elected her as Magistra in 1136; she founded the monasteries of Rupertsberg in 1150 and Eibingen in 1165. She wrote theological, botanical, and medicinal texts, as well as letters, liturgical songs for female choirs to sing and poems while supervising miniature illuminations in the Rupertsberg manuscript of her first work, Scivias. There are more surviving chants by Hildegard than by any other composer from the entire Middle Ages, and she is one of the few known composers to have written both the music and the words. One of her works, the Ordo Virtutum, is an early example of liturgical drama and arguably the oldest surviving morality play. She is also noted for the invention of a constructed language known as Lingua Ignota.
Although the history of her formal canonization is complicated, branches of the Roman Catholic Church have recognized her as a saint for centuries. On 10 May 2012, Pope Benedict XVI extended the liturgical cult of Hildegard to the entire Catholic Church in a process known as "equivalent canonization". On 7 October 2012, he named her a Doctor of the Church, in recognition of "her holiness of life and the originality of her teaching."