Anne Parsons (née Messel), Countess of Rosse by Bassano, May 1936
Anne Parsons, Countess of Rosse (née Messel, previously Armstrong-Jones; 8 February 1902 – 3 July 1992), was a society hostess and one of the founders of The Victorian Society and the mother of Antony Armstrong-Jones, 1st Earl of Snowdon.
Anne made her debut in society in 1922 and three years later married Ronald Armstrong-Jones, a barrister, with whom she had two children, Susan (b. 1927, later Viscountess Vesci) and Antony (b. 1930, later Earl of Snowdon). Anne and her husband separated in 1933.
source: National Portrait Gallery