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.
Frowin of Engelberg Frowin of Engleberg, in German "Frowin von Engelberg" (died 11 March 1178) was a Swiss German Benedictine abbot. Though never formally beatified, Frowin was styled "Blessed" by some chroniclers.