Question: What is the earliest year that Juliane von Schwellenberg could have served Queen Charlotte of Great Britain as the queen's bedchamber maiden?
Sentence (from "Juliane von Schwellenberg"): Juliane Elisabeth von Schwellenberg (1728–1797), also known as "Madam Schwellenberg", was a bedchamber woman of the queen consort of Great Britain, Charlotte of Mecklenburg-Strelitz.
Relevant evidence: Yes