Ptolemy I Soter: Founder of the Ptolemaic Dynasty of Egypt

Ptolemy I Soter was a Macedonian general of Alexander the Great who took control of Egypt after Alexander’s death and became its king in 305 BC. Ruling until 282 BC, he turned Egypt into a powerful Hellenistic kingdom with its capital at Alexandria. The Ptolemaic dynasty he founded lasted almost three centuries, ending with Cleopatra VII in 30 BC.

Early life and the companion of Alexander

Ptolemy was born around 367 BC in Macedonia, the son of a nobleman named Lagus and his wife Arsinoe. For this reason his dynasty is sometimes called the Lagid dynasty. He grew up at the court of King Philip II and was one of the young companions of Philip’s son Alexander.

Around 337-336 BC, Ptolemy was exiled by Philip with several other friends of Alexander, after a quarrel over a proposed marriage alliance. When Alexander became king later that year, he recalled them. Ptolemy served throughout the campaign against Persia, though he held no major command at first.

In 330 BC he became one of Alexander’s seven personal bodyguards, an elite group of trusted officers. In 329 BC he captured Bessus, the Persian noble who had murdered Darius III. He later fought in Central Asia and India. At the mass weddings at Susa in 324 BC he married a Persian noblewoman, Artakama.

Ptolemy later wrote a history of Alexander’s campaigns. It is now lost, but it was a main source for Arrian’s Anabasis of Alexander, the most reliable surviving account of the conquests.

Satrap of Egypt

Alexander the Great died in Babylon in June 323 BC without an adult heir. In the settlement among his generals, Ptolemy chose Egypt as his province, or satrapy. Egypt was rich, easy to defend and far from the main rivals.

He quickly removed Cleomenes of Naucratis, who had run Egypt’s finances and was suspected of disloyalty, and had him put to death. He also took over Cyrenaica, in modern Libya, in 322 BC.

In 321 BC Ptolemy made a bold move. Alexander’s embalmed body was being carried from Babylon on an elaborate funeral cart. Ptolemy met the procession in Syria and brought the body to Egypt, where it was placed first in Memphis and later in Alexandria. Possessing the body gave him enormous prestige.

This defiance provoked the regent Perdiccas, who invaded Egypt in 320 BC. His army failed to cross the Nile near Memphis, and many soldiers drowned or were eaten by crocodiles. His own officers, including Seleucus, then murdered him. Ptolemy was offered the regency of the empire but declined, preferring to secure Egypt.

Wars of the successors

For the next two decades Ptolemy took part in the Wars of the Diadochi, the struggles among Alexander’s successors. His main aims were to protect Egypt and to control the lands that guarded it: Coele-Syria (southern Syria and Palestine), Cyprus and the Aegean.

His main rival was Antigonus the One-Eyed, who sought to rule all of Alexander’s empire. In 312 BC Ptolemy and Seleucus defeated Antigonus’s son Demetrius at the Battle of Gaza, which allowed Seleucus to return to Babylon and later found the Seleucid Empire.

Fortune turned in 306 BC, when Demetrius destroyed Ptolemy’s fleet at Salamis in Cyprus, and Ptolemy lost the island. Later that year Antigonus and Demetrius invaded Egypt by land and sea, but Ptolemy held the Nile line and the invasion failed.

During Demetrius’s long siege of Rhodes in 305-304 BC, Ptolemy sent supplies and troops to help the islanders. According to ancient writers, the grateful Rhodians honoured him as a god and gave him the title Soter, meaning “Saviour”. Some historians think the title was attached to him later, but it became his standard name.

When the allied kings defeated Antigonus at Ipsus in 301 BC, Ptolemy did not join the battle. He occupied Coele-Syria instead, and the dispute over this territory led to a long series of Syrian Wars between the Ptolemies and the Seleucids. He recovered Cyprus around 295-294 BC.

King of Egypt

After Alexander’s family had been murdered, Antigonus and Demetrius took the title of king in 306 BC. Ptolemy followed in 305 BC, proclaiming himself king. To the Greeks he was a Macedonian monarch; to the Egyptians he was a pharaoh, shown in temple reliefs offering to the gods in traditional style.

Even before taking the title, he had worked to win over Egyptian priests. The Satrap Stele of 311 BC records how he, as satrap, restored lands to a temple in the Delta. Ptolemy also promoted the cult of Serapis, a god combining features of Osiris, the Apis bull and Greek deities, to appeal to both Greeks and Egyptians.

He moved the seat of government from Memphis to the new city described in Founding of Alexandria. He founded Ptolemais Hermiou in Upper Egypt as a Greek city and settled Greek and Macedonian soldiers on land across the country.

Alexandria and the Mouseion

Ptolemy laid the foundations of Alexandria’s cultural greatness. He began the Mouseion, a community of scholars supported by the king, and probably the first collections of the Library of Alexandria, which his son greatly expanded. The Athenian statesman Demetrius of Phalerum, who came to his court, is said to have advised him.

Scholars such as the mathematician Euclid are traditionally placed in Alexandria during his reign. The building of the Lighthouse on Pharos was also begun under Ptolemy I and completed under his son.

Coins and royal image

Ptolemy’s coinage shows how he presented his power. His early silver coins carried a portrait of Alexander wearing an elephant-scalp headdress, recalling the conquest of India and stressing Ptolemy’s link to the dead king. After he became king, his own portrait, with a strong jaw and deep-set eyes, appeared on the coins, together with an eagle standing on a thunderbolt. This design remained the standard type of Ptolemaic silver for generations.

Key people

• Alexander the Great: King of Macedon, whose conquests and early death gave Ptolemy his opportunity.
• Perdiccas: Regent of the empire after 323 BC, who invaded Egypt and was killed by his own officers.
• Antigonus I and Demetrius: Father and son who sought to rule Alexander’s whole empire and were Ptolemy’s chief enemies.
• Berenice I: Ptolemy’s queen and mother of his heir.
• Ptolemy II Philadelphus: His son and successor, who expanded Alexandria and its Library.

Succession and death

Ptolemy married several times. His wife Eurydice, daughter of the regent Antipater, bore him Ptolemy Keraunos, but he later preferred Berenice, and their son became his chosen heir. In 285 BC he made this son, Ptolemy II Philadelphus, co-ruler, ensuring a peaceful handover.

Ptolemy I died in about 283 or 282 BC, aged around 84, one of the few of Alexander’s successors to die of old age. Ptolemy II later honoured his parents as gods, the Theoi Soteres, or “Saviour Gods”.

Timeline

• c. 367 BC: Ptolemy is born in Macedonia.
• 330 BC: He becomes one of Alexander’s seven bodyguards.
• 323 BC, June: Alexander dies; Ptolemy receives Egypt as satrap.
• 321 BC: He seizes Alexander’s body and brings it to Egypt.
• 320 BC: Perdiccas’s invasion of Egypt fails and he is murdered.
• 312 BC: Ptolemy and Seleucus win the Battle of Gaza.
• 306 BC: Ptolemy loses Cyprus at Salamis but repels an invasion of Egypt.
• 305 BC: Ptolemy takes the title of king.
• 285 BC: Ptolemy II becomes co-ruler.
• c. 283-282 BC: Ptolemy I dies.

Why it matters

Ptolemy I was the most successful of Alexander’s generals in securing a lasting kingdom. The state he built blended Macedonian rule with Egyptian tradition and made Alexandria the intellectual capital of the Greek world. His dynasty, which ended with Cleopatra VII, shaped Egypt and the eastern Mediterranean until the Roman conquest.