Chamber servant tax [Germany / Bavaria] [Unconfirmed]
Commentary from other sources:
1) During the “Jewish-privilege” era of Kaiser Friederichs II, Jews are called “servi camrae” (Kammerknecht) for the first time in order to mark their special legal status as being “unfree.” In the following years, it become increasingly common for the emperor to pledge, rent or sell the existing “Jewish-safty-regulations” to any territorial lords. So up to the mid 14th century, Jews were considered “chamber servants” in Bavaria and had to pay had their taxes to the dukes.
“Chronologie zur Geschichte de Juden in Bayern (906 – 1945);” RIJO RESEARCH; rijo.homepage.t-online.de