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Philip III Arrhidaeus (Greek: Φίλιππος Αρριδαίος; ca. 359 BC – December 25, 317 BC), king of Macedonia from June 10, 323 BC until his death, was a son of King Philip II of Macedon by Philinna of Larissa, allegedly a Thessalian dancer, and a half-brother of Alexander the Great. Named Arrhidaeus at birth, he assumed the name Philip when he ascended to the throne.

He was apparently "mentally retarded". In Plutarch's report, he became feeble-minded and epileptic following a poisoning attempt by Philip II's wife, Queen Olympias, who wanted to eliminate a possible rival to her son Alexander. However, this may just be malicious gossip, and there is no evidence that Olympias really caused her stepson's condition. Alexander was very fond of him, and took him on his campaigns, both to protect his life and to ensure he would not be used as a pawn in a challenge for the throne. After Alexander's untimely death in Babylon, Arrhidaeus was proclaimed king by the Macedonian army in Asia. However, he was a mere figurehead, and a pawn of the powerful generals, one after the other. His reign and his life did not last long.

The Ariadaeus crater on the Moon was named after him.

He appears to have never been a danger for Alexander's succession to Philip II, notwithstanding their being of about the same age; all the same, when the satrap of Caria Pixodarus proposed his daughter in marriage to Philip, who offered Arrhidaeus as husband, Alexander thought it prudent to block the operation, with considerable irritation of his father (337 BC). Arrhidaeus' whereabouts under the reign of his brother Alexander are unclear: what is certain is that no civil or military command was given him in those thirteen years (336 BC–323 BC).

He was at Babylon at the time of Alexander's death, the 11 June 323 BC. A succession crisis erupted: Arrhidaeus was the most obvious candidate, but he was mentally unfit to rule. A conflict exploded 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 relative living 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 son as co-sovereign should he prove a male, as he did, and joined his uncle with the name of Alexander. It was immediately decided that Philip Arrhidaeus would reign, but not rule: this was to be the prerogative of the new regent, Perdiccas.

When news arrived in Macedon that Arrhidaeus had been chosen as king, Cynane, a daughter of Philip II, matured the design to travel to Asia and offer the new king her daughter Eurydice for wife. This move was an obvious affront to the regent, who Cynane had completely bypassed: to prevent the move Perdiccas sent his brother Alcetas to kill Cynane, but reactions among the troops generated by this murder was such that the regent had to give up and accept the marriage. From that moment on Philip Arrhidaeus was to be under the sway of his bride, a proud and determined woman bent on substantiating her husband's power.

Eurydice's chance came when the first war of the Diadochi sealed the fate of Perdiccas, making a new settlement necessary, settlement that was made at Triparadisus in Syria in 320 BC. Eurydice moved deftly enough to obtain the removal of the first two designed regents, Peithon and Arrhidaeus, but was powerless to block the too powerful Antipater: the latter was made new regent and Philip Arrhidaeus and his wife were forced to follow him to Macedon.

The regent died of natural causes the following year, nominating as his successor not his son Cassander, but a friend of his, Polyperchon. Cassander's refusal to accept his father's decision sparked the second war of the Diadochi, in which Eurydice saw once again a chance to free Philip from the control of the regent. An opportunity presented itself in 317 BC, when Cassander expeled Polyperchon from Macedon: Eurydice immediately allied herself with him and made her husband nominate him new regent, and Cassander reciprocated by leaving her in full control of the country when he left to campaign in Greece. Another important designation was that of Eumenes as new commander of the Macedonian forces in Asia, dismissing in this way Polyperchon's strongest ally, Antigonus Monophthalmus.

But all this was to prove exceedingly volatile: that same year (317) Polyperchon and Olympias, allied with the king of Epirus Aeacides, invaded Macedon, while the Macedonian troops refused to fight the son of Alexander, whom the invaders had brought with them. Philip and Eurydice had no choice but to escape, only to be captured at Amphipolis and thrown into prison. It soon became clear that Philip was too dangerous to be left alive, as many enemies of Olympias saw him as a useful tool against her, and so on December 25 317 BC she had him executed, while his wife was forced to commit suicide.

The following year, when Cassander reconquered Macedon and avenged Philip's death, he interred the bodies of Philip and Eurydice with royal pomp at Aegae, and celebrated funeral games to their honour.

In 1977 important excavations were made near Vergina leading to the discovery of a two-chambered royal tomb, with an almost perfectly conserved male skeleton. Manolis Andronikos, the chief archaeologist on the ground, decided it was the skeleton of Philip II, but many have disputed this attribution and instead proposed it to be the remains of Philip Arrhidaeus, as the style of the tomb relates better to his date of death (317 BC) than that of his father (336 BC). Other reasons are the near absence of injuries, quite strange for a warrior such as Philip II; and lastly, it is argued that only a "dry cremation" could result in such a preservation of the skeleton (a dry cremation means that the body is cremated long after the time of death, as was the case with Philip Arrhidaeus but not with Philip II).

Alexander's tragic half-brother appears briefly in Mary Renault's The Persian Boy and becomes one of the principal characters in the sequel Funeral Games.

• Smith, William (editor); Dictionary of Greek and Roman Biography and Mythology, "Arrhidaeus (1)", "Eurydice (3)", Boston, (1867)

• Livius.org: Arridaeus by Jona Lendering
• Wiki Classical Dictionary: Arrhidaeus
• Page about coinage during his reign
• An archaeological report about his grave and remains

v • d • e Kings of Macedon
Argeads	Karanus · Koinos · Tyrimmas · Perdiccas I · Argaeus I · Philip I · Aeropus I · Alcetas I · Amyntas I · Alexander I · Alcetas II · Perdiccas II · Archelaus I · Craterus · Orestes and Aeropus II · Archelaus II · Amyntas III · Pausanias · Amyntas III · Argaeus II · Amyntas III · Alexander II · Ptolemy I1 · Perdiccas III · Amyntas IV · Philip II · Alexander the Great · Antipater1 · Philip III2 · Alexander IV2 · Perdiccas1 · Antipater1 · Polyperchon1 · Cassander1
Antipatrids	Cassander · Philip IV · Alexander V · Antipater II
Antigonids	Demetrius I · Lysimachus and Pyrrhus · Ptolemy II · Meleager · Antipater Etesias · Sosthenes · Antigonus II · Demetrius II · Antigonus III · Philip V · Perseus
1 Regent of Macedon · 2 Titular king only