The convent of St. Marienthal is a Cistercian abbey, which currently (January 2020) houses 10 nuns. St. Marienthal is the oldest nunnery of this order in Germany, which has existed uninterruptedly since its foundation.
Following the monastic tradition, the monastery was founded in 1234 by Kunigunde, wife of King Wenzel of Bohemia, near a trade route leading from Prague via Zittau to Görlitz. As early as 1235 St. Marienthal was incorporated into the Cistercian Order and assigned to its Bohemian province.
Further information on the history of the St. Marienthal Monastery can be found here. https://de.wikipedia.org/wiki/Kloster_St._Marienthal