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.
Sophia Albertina, Abbess of Quedlinburg Princess Sophia Albertina of Sweden ("Sophia Maria Lovisa Fredrika Albertina"; 8 October 1753 – 17 March 1829) was the last Princess-Abbess of Quedlinburg Abbey and as such reigned as vassal monarch of the Holy Roman Empire.