question: What is the earliest year that Juliane von Schwellenberg could have served Queen Charlotte of Great Britain as the queen's bedchamber maiden?
answer: 1761
context: Title: Juliane von Schwellenberg
  Passage: 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.  She was a well known and prominent profile of the British royal court and household, where she took a dominant position.  She is also frequently mentioned in contemporary satires, songs, memoirs, diaries and other writings, such as those of Fanny Burney, with whom she was involved in a famous conflict.  von Schwellenberg was a favorite and confidant of queen Charlotte, and handled access between the queen and various supplicants, which gave her an important influence.
  Title: Samuel Wathen
  Passage: Samuel Wathen, M.D. (c. 1720–1787) was an English physician who practised in London during the Georgian era.  He was the personal physician to Rev. John Wesley and may have served Queen Charlotte of England as a male midwife.
  Title: Charlotte of Mecklenburg-Strelitz
  Passage: Charlotte of Mecklenburg-Strelitz (Sophia Charlotte; 19 May 1744 – 17 November 1818) was by marriage to King George III the Queen of Great Britain and Ireland from her wedding in 1761 until the union of the two kingdoms in 1801, after which she was Queen of the United Kingdom of Great Britain and Ireland until her death in 1818.  She was also the Electress of Hanover in the Holy Roman Empire until the promotion of her husband to King of Hanover on 12 October 1814, after which she was also queen consort of Hanover.
citations: Charlotte of Mecklenburg-Strelitz Juliane von Schwellenberg