In what year was the abbess who wrote the biography of Bertha of Bingen born?
Hildegard of Bingen Hildegard of Bingen, O.S.B. (German: "Hildegard von Bingen" ; ; 1098 – 17 September 1179), also known as Saint Hildegard and Sibyl of the Rhine, was a German Benedictine abbess, writer, composer, philosopher, Christian mystic, visionary, and polymath. She is considered to be the founder of scientific natural history in Germany.
Gisela of Kerzenbroeck Gisela of Kerzenbroeck or Gisela von Kerssenbrock (died by 1300) was a nun in the northern German city of Rulle who probably worked most of her life writing and illustrating manuscripts, as well as being choirmistress.