Töss Monastery was a community of Dominican nuns located in the former Swiss city of Töss, now a part of Winterthur. Nothing of the original buildings exists today. Construction of the monastery began in 1233, near the bridge at the Töss River by command of Count Hartmann IV of Kyburg. In December of the same year, the monastery was confirmed by Bishop Heinrich von Tanne of Constance. In 1235 Pope Gregory IX placed it under the authority of the Predigerkloster in Zürich. Initially the nuns followed the Rule of St. Augustine but in 1245 it became a Dominican monastery. Over the following centuries, the monastery grew until it owned properties or incomes in about 130 communities around the Canton of Zürich. It was originally part of the Kyburg Herrschaft until 1264. It then passed to the Hab