"Susanne Katharina Seiffart von Klettenberg (19 December 1723 – 16 December 1774) was a German abbess and writer. She was a friend of Katharina Elisabeth Goethe, the mother of writer Johann Wolfgang von Goethe. Klettenberg corresponded with Goethe, and he shaped a character, "Beautiful Soul," after her in his novel Wilhelm Meister´s Apprenticeship. She was also a friend of Friedrich Christoph Steinhofer (1706–1761), a former co-episcopus of the Moravian Church." - (en.wikipedia.org 14.02.2020)
