Alexandrina Dawson-Damer, Countess of Portarlington
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Alexandrina Octavia Maria Dawson-Damer, Countess of Portarlington (née Lady Alexandrina Octavia Maria Vane; 29 July 1823 – 15 January 1874) was an Irish aristocrat who was the wife of Henry Dawson-Damer, 3rd Earl of Portarlington and the daughter of Charles Vane, 3rd Marquess of Londonderry.