Archibald Philip Primrose , 5th Earl of Rosebery , 1st Earl of Midlothian , KG , PC ( 7 May 1847 -- 21 May 1929 ) was a British Liberal statesman and Prime Minister .
Archibald Philip Primrose , 5th Earl of Rosebery , KG , PC ( 7 May 1847 -- 21 May 1929 ) was a British Liberal statesman and Prime Minister .