Alexandrina Dawson-Damer, Countess of Portarlington

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.

[a] She was the second daughter of Anglo-Irish nobleman Charles Vane, 3rd Marquess of Londonderry, and, his second wife, Frances Anne Emily Vane-Tempest.

Her mother was the only daughter and heiress of Sir Henry Vane-Tempest, 2nd Baronet, and Anne MacDonnell, suo jure 2nd Countess of Antrim.

[3] On 2 September 1847, Lady Alexandrina was married to Henry Dawson-Damer, 3rd Earl of Portarlington (1822–1889), the son of Capt.

[3] Lady Portarlington converted to Catholicism in 1867 and died on 15 January 1874 at Emo Park, where she was also buried.