Elizabeth Lamb, Viscountess Melbourne

"Elizabeth Lamb, Viscountess Melbourne (née Elizabeth Milbanke; 1751 – 1818) was one of the most influential of the political hostesses of the extended Regency period, and the wife of Whig politician Peniston Lamb, 1st Viscount Melbourne. She was the mother of William Lamb, 2nd Viscount Melbourne who became Prime Minister of the United Kingdom amongst several other influential children. Lady Melbourne was known not just for her political influence but also for her friendships and romantic relationships with members of London society including Georgiana Cavendish, Duchess of Devonshire, George, Prince of Wales and Lord Byron.Because of her numerous love affairs, the paternity of her children is a matter of dispute."

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Links:

http://en.wikipedia.org/wiki/Elizabeth_Lamb,_Viscountess_Melbourne

http://www.thepeerage.com/p16028.htm#i160271