In what year was the abbess who wrote the biography of Bertha of Bingen born?
Bertha of Bingen Saint Bertha of Bingen (German: "Heilige Berta", died ca. 757) was the mother of Rupert of Bingen. Her biography was written, and subsequently her cult popularized, by Hildegard of Bingen, who lived in the same region, about three hundred years later. Bertha and Rupert share a feast day on May 15.
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.