Maria Ponsonby, Viscountess Duncannon
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Maria Ponsonby, Viscountess Duncannon (11 May 1787 ā 19 March 1834), formerly Lady Maria Fane, was the wife of John Ponsonby, 4th Earl of Bessborough. She died before he inherited the earldom and thus was never Countess of Bessborough, but three of her sons were successively earls of Bessborough.