Antony Armstrong-Jones, 1st Earl of Snowdon (7 March 1930 – 13 January 2017), who married Princess Margaret Anne married Michael Parsons, 6th Earl of Rosse , on 19 September 1935. Rosse had extensive estates in Ireland and was nicknamed "The Adonis of the Peerage".
Sarah Armstrong-Jones was born on 1 May 1964 at Kensington Palace in London. She is the second child and only daughter of Princess Margaret and Antony Armstrong-Jones, 1st Earl of Snowdon. She was christened in the private chapel at Buckingham Palace on 13 July 1964.