Archibald Philip Primrose, 5th Earl of Rosebery, 1st Earl of Midlothian (7 May 1847 – 21 May 1929), was a career politician, holding several high ranking offices, including Prime Minister of the United Kingdom. He married the wealthiest heiress of her day, Hannah de Rothschild (27 July 1851 – 19 November 1890), on 20 March 1878. They had four children.