Philip III of Macedon
Philip III Arrhidaeus (c. 359 BC – 317 BC) was the elder half‑brother of Alexander the Great and the nominal king of Macedon from 323 to 317 BC. Born Arrhidaeus, he assumed the regnal name Philip III when the Macedonian army proclaimed him king after Alexander’s death. Ancient historians consistently describe him as a figurehead ruler controlled by the Diadochi during the turbulent years following Alexander’s empire.
Early Life
Philip was the son of Philip II of Macedon and Philinna of Larissa. Ancient writers report that he suffered from a mental or developmental impairment, possibly caused by poisoning during childhood. As a result, he played no significant role in Macedonian politics during the reign of his father or his half‑brother Alexander.
Accession to the Throne
Upon the death of Alexander the Great in 323 BC, the Macedonian army faced a succession crisis. With no adult heir available, the generals proclaimed Arrhidaeus as king under the regnal name Philip III. He ruled jointly with the infant Alexander IV of Macedon, the posthumous son of Alexander and Roxana.
Real power, however, rested with the regents:
Philip III served primarily as a symbolic monarch whose presence legitimized the decisions of the competing Diadochi.
Role During the Wars of the Diadochi
Throughout his reign, Philip III was moved from place to place by whichever general held power. He had no independent authority and was used as a political pawn to justify claims of legitimacy.
Key events include:
- Perdiccas’ attempt to control the royal family
- Antipater’s regency and the shifting alliances among the Diadochi
- Polyperchon’s use of Philip III as a counterweight to Cassander
- Cassander’s eventual seizure of Macedon
Philip’s presence was essential because the Macedonian army still respected the Argead dynasty, even though the dynasty itself was collapsing.
Death
In 317 BC, during the renewed struggle for control of Macedon, Olympias—mother of Alexander the Great—ordered the execution of Philip III. She viewed him as a threat to the succession of her grandson Alexander IV and as a tool of her political enemies. Philip was killed along with his wife Eurydice.
His death effectively ended the Argead dynasty, which had ruled Macedon for centuries.
Historical Significance
Philip III Arrhidaeus is remembered as:
- the last adult king of the Argead line
- a figurehead ruler during the chaotic years after Alexander’s death
- a central symbol in the legitimacy struggles of the Diadochi
- a tragic example of royal manipulation and political exploitation
Although he exercised no real power, his reign marks the beginning of the fragmentation of Alexander’s empire and the rise of the Hellenistic kingdoms.
See Also
- Alexander the Great
- Alexander IV of Macedon
- Philip II of Macedon
- Diadochi
- Cassander
- Antipater
- Polyperchon