Question: What is the earliest year that Juliane von Schwellenberg could have served Queen Charlotte of Great Britain as the queen's bedchamber maiden?

<P0-S0> Irish migration to Great Britain has occurred from the earliest recorded history to the present. <P0-S1>  There has been a continuous movement of people between the islands of Ireland and Great Britain due to their proximity. <P0-S2>  This tide has ebbed and flowed in response to politics, economics and social conditions of both places. <P0-S3>  Ireland was a feudal Lordship of the Kings of England between 1171 and 1541; a Kingdom in personal union with the Kingdom of England and Kingdom of Great Britain between 1542 and 1801; and politically united with Great Britain as the United Kingdom of Great Britain and Ireland between 1801 and 1922. <P0-S4>  Today, Ireland is divided between the independent Republic of Ireland and Northern Ireland. <SEP> <P1-S0> The Queen Charlotte Triple Junction is a geologic triple junction where three tectonic plates meet: the Pacific Plate, the North American Plate, and the Explorer Plate. <P1-S1>  The three plate boundaries which intersect here are the Queen Charlotte Fault, the northern Cascadia subduction zone, and the Explorer Ridge. <P1-S2>  The Queen Charlotte triple junction is currently positioned adjacent to the Queen Charlotte Sound near the Dellwood Knolls off the coast of Vancouver Island. <P1-S3>  10 Ma to 1.5 Ma prior to the triple junction’s current location, it was located southwest of Vancouver Island The movements of the triple junction have been characterized by two major shifts in the Pacific-North American Tertiary plate tectonic record. <P1-S4>  First, at approximately 40 Ma the relative plate motions switched from orthogonal convergence to right-lateral strike slip. <P1-S5>  The variance in location of the triple junction may have also been related to the formation of an independent basin block. <P1-S6>  This formation could have been produced by fore-arc bending of the Pacific Plate, due to oblique underthrusting prior to 1 Ma which produced stresses sufficient to break the Pacific Plate and isolate the block. <P1-S7>  Transpression of 15–30 mm/yr since 5 Ma has been taking place, as well as varying amounts of both transpression and transtension occurring before then. <P1-S8>  To the northwest of the triple junction the Pacific plate currently has 15 degrees of oblique convergence, passing under the North American plate along the Queen Charlotte transform fault zone. <P1-S9>  The Explorer plate is a small chunk of the Juan de Fuca plate that broke away from the Juan de Fuca Plate about 3.5 Ma and has moved much slower with respect to North America. <SEP> <P2-S0> 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. <P2-S1>  She was a well known and prominent profile of the British royal court and household, where she took a dominant position. <P2-S2>  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. <P2-S3>  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. <SEP> <P3-S0> 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. <P3-S1>  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.