The Faisal–Weizmann Agreement was a 3 January 1919 agreement between Emir Faisal, the third son of Hussein ibn Ali al-Hashimi, King of the short-lived Kingdom of Hejaz, and Chaim Weizmann, a Zionist leader who had negotiated the 1917 Balfour Declaration with the British government, signed two weeks before the start of the Paris Peace Conference. Together with a letter written by T. E. Lawrence in Faisal's name to Felix Frankfurter in March 1919, it was one of two documents used by the Zionist delegation at the Peace Conference to argue that the Zionist plans for Palestine had prior approval of Arabs.