In 1964 , the first summit of the League of Arab States , held in Cairo in January , resulted in a mandate for the creation of a Palestinian entity . Subsequently , in May , the Palestine Liberation Organization was established during a meeting of the Palestinian National Congress in Arab-controlled Jerusalem . The organisation 's establishment was formally approved at the Arab League 's second summit , held in Alexandria in October . The PLO was granted full membership in 1976 . Its seat was assumed by the State of Palestine following the declaration of independence in 1988 . The PLO was accorded full membership in the Organisation of the Islamic Conference ( OIC ; now named Organisation of Islamic Cooperation ) in 1969 ; it attended the founding conference , held in Rabat in September 1969 , as an observer . Its seat was assumed by the State of Palestine following the declaration of independence in 1988 . It is also a member of the Islamic Development Bank , an international financial institution for member states of the OIC
first summit
1964 Arab League summit (Cairo)
Foreign relations of the State of Palestine