Philip III of Macedon

Philip III Arrhidaeus
King of Macedonia
Tetradrachm of Philip III Arrhidaeus
Reign	traditional: 323–317 BC
Predecessor	Alexander III
Successor	Alexander IV
Spouse	Eurydice
Dynasty	Argead dynasty
Father	Philip II
Mother	Philinna of Larissa
Religion	Ancient Greek religion

Philip III Arrhidaeus (Ancient Greek: Φίλιππος Γ΄ ὁ Ἀρριδαῖος; c. 359 BC – 25 December, 317 BC) reigned as king of Macedonia from after 11 June 323 BC until his death. He was a son of King Philip II of Macedonia by Philinna of Larissa, and thus an elder half-brother of Alexander the Great. Named Arrhidaeus at birth, he assumed the name Philip when he ascended to the throne.

As Arrhidaeus grew older it became apparent that he had mild learning difficulties. Plutarch was of the view that he became disabled by means of an attempt on his life by Philip II's wife, Queen Olympias, who wanted to eliminate a possible rival to her son, Alexander, through the employment of pharmaka (drugs/spells); however, most modern authorities doubt the truth of this claim.

Alexander was fond of Arrhidaeus and took him on his campaigns, both to protect his life and to prevent his use as a pawn in any prospective challenge for the throne. After Alexander's death in Babylon in 323 BC, the Macedonian army in Asia proclaimed Arrhidaeus as king; however, he served merely as a figurehead and as the pawn of a series of powerful generals.

Even though Arrhidaeus and Alexander were about the same age, Arrhidaeus appears never to have been a danger as an alternative choice for Alexander's succession to Philip II; nevertheless, when the Persian satrap of Caria, Pixodarus, proposed his daughter in marriage to Philip, the king declined, offering his son Arrhidaeus as husband instead, and Alexander thought it prudent to block the dynastic union (which might have produced a possible future heir to Philip's domain before Alexander himself did), resulting in considerable irritation on the part of his father (337 BC). Arrhidaeus' whereabouts during the reign of his brother Alexander are unclear from the extant sources; what is certain is that no civil or military command was given to him in those thirteen years (336–323 BC).

He was in Babylon at the time of Alexander's death on 10 June 323 BC. A succession crisis ensued. Arrhidaeus was the most obvious candidate, but he was mentally unfit to rule. A conflict then arose between Perdiccas, leader of the cavalry, and Meleager, who commanded the phalanx: the first wanted to wait to see if Roxana, Alexander's pregnant wife, would deliver a male baby, while the second objected that Arrhidaeus was the closest living relative and so should be chosen king. Meleager was killed, and a compromise was engineered: Arrhidaeus would become king, with the name of Philip, and he would be joined by Roxana's yet-unborn child as co-sovereign should that child prove a male. This eventuality did indeed arise and resulted in Roxana's son, Alexander, becoming with his uncle Phillip III co-sovereign on the throne of Macedon. It was immediately decided that Philip Arrhidaeus would reign, but not rule: this was to be the prerogative of the new regent, Perdiccas.