1953, George P. Sanders, Agriculture Handbook 54: Cheese Varieties and Descriptions, Agricultural Research Service, page 113, Sapsago cheese has been made in the Canton of Glarus, Switzerland, for at least 500 years and perhaps more; it is made also in Germany. It is known by various other names, including Schabziger, Glarnerkäse, Grünerkäse, Krauterkäse, and Grünerkrauterkäse.
Source: wiktionary