He was the son ofArsinoe of Macedonia. His father is unknown. He was described in ancient times as the son of Lagus, a Macedonian nobleman, but there are also suggestions that he was illegitimate, and even that he was the son of Philip II of Macedon (which would make him the half-brother of Alexander the Great if true). Ptolemy was one of Alexander the Great‘s most trusted generals, and among the seven “body-guards” attached to his person. He was a few years older than Alexander, and his intimate friend since childhood. He may even have been in the group of noble teenagers tutored by Aristotle. He was with Alexander from his first campaigns, and played a principal part in the later campaigns in Afghanistan and India. At the Susa marriage festival in 324, Alexander had him marry the Persian princess Atacama. Ptolemy also had a consort queen in Thaïs, the famous Athenian hetaera and one of Alexander’s companions in his conquest of the ancient world.
Successor of Alexander
When Alexander died in 323, Ptolemy is said to have instigated the resettlement of the empire made at Babylon. Through the Partition of Babylon, he was now appointed satrap of Egypt, under the nominal kings Philip Arrhidaeus and the infant Alexander IV; the former satrap, the Greek Cleomenes, stayed on as his deputy. Ptolemy quickly moved, without authorization, to subjugate Cyrenaica.
By custom, kings in Macedonia asserted their right to the throne by burying their predecessor. Probably because he wanted to pre-empt Perdiccas, the imperial regent, from staking his claim in this way, Ptolemy took great pains in getting his hands on the body of Alexander the Great, placing it temporarily in Memphis. Ptolemy then openly joined the coalition against Perdiccas. Perdiccas appears to have suspected Ptolemy of aiming for the throne himself, and maybe decided that Ptolemy was his most dangerous rival. Ptolemy executed Cleomenes for spying on behalf of Perdiccas — this removed the chief check on his authority, and allowed Ptolemy to obtain the huge sum that Cleomenes had accumulated. 
In 321, Perdiccas invaded Egypt. Ptolemy decided to defend the Nile, and Perdiccas’s attempt to force it ended in fiasco, with the loss of 2000 men. This was a fatal blow to Perdiccas’ reputation, and he was murdered in his tent by two of his subordinates. Ptolemy immediately crossed the Nile, to provide supplies to what had the day before been an enemy army. Ptolemy was offered the regency in place of Perdiccas; but he declined. Ptolemy was consistent in his policy of securing a power base, while never succumbing to the temptation of risking all to succeed Alexander.
In the long wars that followed between the different Diadochi, Ptolemy’s first goal was to hold Egypt securely, and his second was to secure control in the outlying areas: Cyrenaica and Cyprus, as well as Syria, including the province of Judea. His first occupation of Syria was in 318, and he established at the same time a protectorate over the petty kings of Cyprus. When Antigonus One-Eye, master of Asia in 315, showed dangerous ambitions, Ptolemy joined the coalition against him, and on the outbreak of war, evacuated Syria. In Cyprus, he fought the partisans of Antigonus, and re-conquered the island (313). A revolt in Cyrene was crushed the same year.
In 312, Ptolemy and Seleucus, the fugitive satrap of Babylonia, both invaded Syria, and defeated Demetrius Poliorcetes (“sieger of cities”), the son of Antigonus, in the Battle of Gaza. Again he occupied Syria, and again—after only a few months, when Demetrius had won a battle over his general, and Antigonus entered Syria in force—he evacuated it. In 311, a peace was concluded between the combatants. Soon after this, the surviving 13-year-old king, Alexander IV, was murdered in Macedonia, leaving the satrap of Egypt absolutely his own master. The peace did not last long, and in 309 Ptolemy personally commanded a fleet that detached the coastal towns of Lycia and Caria from Antigonus, then crossed into Greece, where he took possession of Corinth, Sicyon and Megara (308 BC). In 306, a great fleet under Demetrius attacked Cyprus, and Ptolemy’s brother Menelaus was defeated and captured in another decisive Battle of Salamis. Ptolemy’s complete loss of Cyprus followed.
The satraps Antigonus and Demetrius now each assumed the title of king; Ptolemy, as well as Cassander, Lysimachus and Seleucus I Nicator, responded by doing the same. In the winter of 306 BC, Antigonus tried to follow up his victory in Cyprus by invading Egypt; but Ptolemy was strongest there, and successfully held the frontier against him. Ptolemy led no further overseas expeditions against Antigonus. However, he did send great assistance to Rhodes when it was besieged by Demetrius (305/304). Pausanius reports that the grateful Rhodians bestowed the name Soter (“saviour”) upon him as a result of lifting the siege. This account is generally accepted by modern scholars, although the earliest datable mention of it is from coins issued by Ptolemy II in 263 BC.
When the coalition against Antigonus was renewed in 302, Ptolemy joined it, and invaded Syria a third time, while Antigonus was engaged with Lysimachus in Asia Minor. On hearing a report that Antigonus had won a decisive victory there, he once again evacuated Syria. But when the news came that Antigonus had been defeated and slain by Lysimachus and Seleucus at the Battle of Ipsus in 301, he occupied Syria a fourth time.
The other members of the coalition had assigned all Syria to Seleucus, after what they regarded as Ptolemy’s desertion, and for the next hundred years, the question of the ownership of southern Syria (ie, Judea) produced recurring warfare between the Seleucid and Ptolemaic dynasties. Henceforth, Ptolemy seems to have mingled as little as possible in the rivalries between Asia Minor and Greece; he lost what he held in Greece, but reconquered Cyprus in 295/294. Cyrene, after a series of rebellions, was finally subjugated about 300 and placed under his stepson Magas.
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