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Establishment

Following Alexander's death in Babylon in 323 BC, a succession crisis erupted among his generals. Initially, Perdiccas ruled the empire as regent for Alexander's half-brother Arrhidaeus, who became Philip III of Macedon, and then as regent for both Philip III and Alexander's infant son Alexander IV of Macedon, who had not been born at the time of his father's death. Perdiccas appointed Ptolemy, one of Alexander's closest companions, to be satrap of Egypt. Ptolemy ruled Egypt from 323 BC, nominally in the name of the joint kings Philip III and Alexander IV. However, as Alexander the Great's empire disintegrated, Ptolemy soon established himself as ruler in his own right. Ptolemy successfully defended Egypt against an invasion by Perdiccas in 321 BC, and consolidated his position in Egypt and the surrounding areas during the Wars of the Diadochi (322–301 BC). In 305 BC, Ptolemy took the title of basileus and pharaoh. As Ptolemy I Soter ("Saviour"), he founded the Ptolemaic dynasty that was to rule Egypt for nearly 300 years.

All the male rulers of the dynasty took the name Ptolemy, while princesses and female rulers preferred the names Cleopatra, Arsinoë and Berenice. The Ptolemies also adopted the Egyptian custom of marrying their sisters, with many of their line ruling jointly with their spouses, who were also of the royal house. This custom made Ptolemaic politics confusingly incestuous, and the later Ptolemies were increasingly feeble. The only basilissa - regnant or female Pharaohs to officially rule on their own were Cleopatra II, Berenice III and Berenice IV. Cleopatra V did co-rule, but it was with another female, Berenice IV. Cleopatra VII officially co-ruled with Ptolemy XIII Theos Philopator, Ptolemy XIV, and Ptolemy XV, but effectively, she ruled Egypt alone.

The early Ptolemies did not disturb the religion or the customs of the Egyptians. They built magnificent new temples for the Egyptian gods and soon adopted the outward display of the pharaohs of old. Rulers such as Ptolemy I Soter respected the Egyptian people and recognized the importance of their religion and traditions. During the reign of Ptolemies II and III, thousands of Macedonian veterans were rewarded with grants of farm lands, and Macedonians were planted in colonies and garrisons or settled themselves in villages throughout the country. Upper Egypt, farthest from the centre of government, was less immediately affected, even though Ptolemy I established the Greek colony of Ptolemais Hermiou to be its capital. But within a century, Greek influence had spread through the country and intermarriage had produced a large Greco-Egyptian educated class. Nevertheless, the Greeks always remained a privileged minority in Ptolemaic Egypt. They lived under Greek law, received a Greek education, were tried in Greek courts, and were citizens of Greek cities.