Wikipedia
A Lord of the Bedchamber, previously known as a Gentleman of the Bedchamber was a courtier in the Royal Household of the King of the United Kingdom and the Prince of Wales. A Lord of the Bedchamber's duties consisted of assisting the King with his dressing, waiting on him when he ate in private, guarding access to him in his bedchamber and closet and providing companionship. The offices were in the gift of The Crown and were originally sworn by Royal Warrant directed to the Lord Chamberlain. From 1660, the first Lord of the Bedchamber was Groom of the Stole.
This is an incomplete list of noblemen who have served as Lord of the Bedchamber:
Usage examples of "lord of the bedchamber".
Feversham (as he was generally called) was Lord of the Bedchamber to King Charles II, which meant that he really ought to have been over in Whitehall just now.
Presently he caught sight, at a distance, of a couple of his ragged Offal Court comrades- one of them the lord high admiral in his late mimic court, the other the first lord of the bedchamber in the same pretentious fiction.