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.
Chelles Abbey Chelles Abbey (French: "Abbaye Notre-Dame-des-Chelles" ) was a Frankish monastery founded c. 658 during the early medieval period. It was intended initially as a monastery for women; then its reputation for great learning grew, and with the afflux of men wishing to follow the monastic life, a parallel male community was established, creating a double monastery.