The daughter of Lord Henry FitzGerald (d. 1829); in 1833 she married Henry Wellesley, first Earl Cowley; she was Maid of Honour to Queen Adelaide.

REFERENCES TO Olivia Cecilia Wellesley, countess Cowley [née FitzGerald-de Ros]:

Thomas Creevey to Elizabeth Ord, 23 September 1831 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)

Lady Louisa Molyneux to Thomas Creevey, 30 October 1833 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)

Thomas Creevey to Elizabeth Ord, 24 April 1837 in The Creevey Papers: A Selection from the Correspondence & Diaries of the late Thomas Creevey, M.P. (London: John Murray, 1903)