The history of Egypt has been long and wealthy, due to the flow of the Nile River with its fertile banks and delta, as well as the accomplishments of Egypt's native inhabitants and outside influence. Much of Egypt's ancient history was a mystery until Egyptian hieroglyphs were deciphered with the discovery and help of the Rosetta Stone. Among the Seven Wonders of the Ancient World, is the Great Pyramid of Giza. Ancient Egyptian civilization coalesced around 3150 BC with the political unification of Upper and Lower Egypt under the first king of the First Dynasty, Narmer. Predominantly native Egyptian rule lasted until the conquest by the Achaemenid Empire in the sixth century BC. In 332 BC, Macedonian ruler Alexander the Great conquered Egypt as he toppled the Achaemenids and established the Hellenistic Ptolemaic Kingdom, whose first ruler was one of Alexander's former generals, Ptolemy I Soter. The Ptolemies had to fight native rebellions and were involved in foreign and civil wars that led to the decline of the kingdom and its final annexation by Rome. The death of Cleopatra ended the nominal independence of Egypt resulting in Egypt's becoming one of the provinces of the Roman Empire. Roman rule in Egypt (including Byzantine) lasted from 30 BC to 641 AD, with a brief interlude of control by the Sasanian Empire between 619 and 629, known as Sasanian Egypt.[1] After the Muslim conquest of Egypt, parts of Egypt became provinces of successive Caliphates and other Muslim dynasties: Rashidun Caliphate (632-661), Umayyad Caliphate (661–750), Abbasid Caliphate (750–935), Fatimid Caliphate (909–1171), Ayyubid Sultanate (1171–1260), and the Mamluk Sultanate (1250–1517). In 1517, Ottoman sultan Selim I captured Cairo, absorbing Egypt into the Ottoman Empire. Egypt remained entirely Ottoman until 1867, except during French occupation from 1798 to 1801.[2] Starting in 1867, Egypt became a nominally autonomous tributary state called the Khedivate of Egypt. However, Khedivate Egypt fell under British control in 1882 following the Anglo-Egyptian War. After the end of World War I and following the Egyptian revolution of 1919, the Kingdom of Egypt was established. While a de jure independent state, the United Kingdom retained control over foreign affairs, defense, and other matters. British occupation lasted until 1954, with the Anglo-Egyptian agreement of 1954. The modern Republic of Egypt was founded in 1953, and with the complete withdrawal of British forces from the Suez Canal in 1956, it marked the first time in 2500 years that Egypt was both fully independent and ruled by native Egyptians. President Gamal Abdel Nasser (president from 1956 to 1970) introduced many reforms and created the short-lived United Arab Republic (with Syria). His terms also saw the Six-Day War and the creation of the international Non-Aligned Movement.