The history of Egypt under Gamal Abdel Nasser covers the period of Egyptian history from the Egyptian revolution of 1952, of which Gamal Abdel Nasser was one of the two principal leaders, spanning Nasser's presidency of Egypt from 1956, to his death in 1970. Nasser's tenure as Egypt's leader heralded a new period of modernisation and socialist reform in Egypt and a staunch advocacy of pan-Arab nationalism (including a short-lived union with Syria) and developing world solidarity. His prestige in Egypt and throughout the Arab world soared in the wake of his nationalisation of the Suez Canal in 1956, and Egypt's political victory in the subsequent Tripartite Aggression, but was damaged badly by Israel's successful invasion and occupation of Egyptian and Palestinian territory in the Six-Day War of 1967.