Arthur James Balfour, 1st Earl of Balfour,KGOMPC (25 July 1848 – 19 March 1930) was a BritishConservative statesman and Prime Minister of the United Kingdom from 1902 until 1905.
He was minister of Foreign Affairs from 1916 to 1919. In this capacity he wrote the so-called Balfour Declaration in 1917.