Lady of the Bedchamber

The Lady of the Bedchamber is the title of a lady-in-waiting holding the official position of personal attendant on a British queen or princess. The position is traditionally held by a female member of a noble family. They are ranked between the First Lady of the Bedchamber and the Women of the Bedchamber. They are also styled Gentlewoman of Her Majesty's Bedchamber.
The equivalent title and office has historically been used in most European royal courts (Dutch: "Dames du Palais"; French: "Dames" or "Dame de Palais"; German: "Hofstaatsdame" or "Palastdame"; Italian: "Dame di Corte"; Russian: "Hofdame" or "Statsdame"; Spanish: "Dueña de honor"; Swedish: "Statsfru").
History.
In the Middle Ages, Margaret of France, the wife of King Edward I of England, is noted to have had seven ladies of the bedchamber: the three married ones were called "Dominæ" and the four unmarried ones were known as maids of honour. Their task was simply to act as the companions (see lady's companion) and personal attendants to the royal woman. 
In a description from 1728, the task of the Ladies of the Bedchamber was to act as the go-between for the queen and the Women of the Bedchamber, who had the task to wait upon the queen by helping her wash, dress and undress, and so forth. A Woman of the Bedchamber worked independently from a Lady of the Bedchamber and did not take orders from her. However, if a Lady of the Bedchamber was present, a Woman of the Bedchamber would always defer to her. If a Lady of the Bedchamber was present when a Woman of the Bedchamber arrived to dress the queen, for example, she would not dress the queen herself, but instead give the garments to the Lady of the Bedchamber, who in turn helped the queen put it on. The procedure was the same in other issues.
The post of a Lady of the Bedchamber was considered prestigious, and the appointments have therefore been subjected to controversies. Queen Anne appointed Sarah Churchill, Duchess of Marlborough, to this position; the Duchess was widely considered an influential royal favourite. In 1839, concerns that Queen Victoria was determined to surround herself with wives of Whig politicians led to the Bedchamber crisis, preventing the installation of a Tory government under Robert Peel.
List of Ladies of the Bedchamber to the Queens of England.
This is an "incomplete" list of those who have served as Lady of the Bedchamber in the British Royal Household.
Anne of Denmark, 1603–1619.
Anne of Denmark was Queen Consort to James I of England.
Henrietta Maria of France, 1625–1649.
Henrietta Maria was Queen Consort to Charles I of England.
Catherine of Braganza, 1662–1692.
Catherine of Braganza was Queen Consort to Charles II of England
Mary of Modena, 1673–1688.
Mary of Modena was Queen Consort to James II of England
Caroline of Ansbach, 1714–1737.
Caroline of Ansbach was Queen Consort to George II of Great Britain
Augusta of Saxe-Gotha, 1736–1772.
Princess Augusta was the wife of Frederick, Prince of Wales
Charlotte of Mecklenburg-Strelitz, 1761–1818.
Charlotte of Mecklenburg-Strelitz was Queen Consort to King George III of Great Britain
Caroline of Brunswick, 1795–1821.
Caroline of Brunswick was the wife of George, Prince of Wales, Prince Regent and from 1820 Queen Consort to George IV of the United Kingdom. They separated in 1796 and she died in 1821.
Adelaide of Saxe-Meiningen, 1830–1837.
Adelaide of Saxe-Meiningen was Queen Consort to William IV of the United Kingdom
Alexandra of Denmark, 1901–1925.
Alexandra of Denmark was Queen Consort to Edward VII of the United Kingdom
Mary of Teck, 1901–1953.
Mary of Teck was Queen Consort to George V of the United Kingdom
Elizabeth Bowes-Lyon, 1937–2002.
Elizabeth Bowes-Lyon was Queen Consort to George VI of the United Kingdom