Earl of Castlemaine
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The Earldom of Castlemaine was a title created in the Peerage of Ireland. It was created for Roger Palmer, the husband of Barbara Palmer (née Villiers), mistress to King Charles II. The Earl was also given the title Baron Limerick.
The title was limited to the his heirs-male by Barbara (i.e. not by any future wife), making it clear that the Earldom was for his wife's services to the King and not his own. As the only child officially fathered by the 1st Earl (which probably was not actually his) was a female, the title went extinct on his death.
