A conference held in East Jerusalem on 27–28 May 1964, in which Palestinian Arab representatives headed by Ahmed Shukeiri proclaimed the Palestine Liberation Organization (PLO), in accordance with the Arab League’s resolution of January 1964, and ratified the first version of the Palestinian National Charter. The establishment of the PLO was endorsed by the Arab League later that year in Alexandria, while the Charter was extensively revised in 1968, following the Six Day War.