Hussein bin Ali, Sharif of Mecca
Henry McMahon had exchanged letters with Faisal's father Hussein bin Ali, Sharif of Mecca in 1915, in which he had promised Hussein control of Arab lands with the exception of "portions of Syria" lying to the west of "the districts of Damascus, Homs, Hama and Aleppo". Palestine lies to the southwest of these areas and wasn't explicitly mentioned. That modern-day Lebanese region of the Mediterranean coast was set aside as part of a future French Mandate. After the war the extent of the coastal exclusion was hotly disputed. Hussein had protested that the Arabs of Beirut would greatly oppose isolation from the Arab state or states, but did not bring up the matter of Jerusalem or Palestine. Between 1916 and 1920, the British government interpreted these commitments as including Palestine in the Arab area. However, in the 1922 Churchill White Paper they argued instead that Palestine had been excluded.