Battle of Gaugamela

The 331 BCE battle near Gaugamela in which Alexander the Great defeated Darius III, breaking the Achaemenid Empire’s ability to resist his conquest.

Alexander the Great: King of Macedon who conquered the Achaemenid Empire and created one of the ancient world’s largest empires. His cavalry-led attack opened the gap that broke Darius’s battle line.
Greco-Persian Wars: A series of conflicts between Greek states and the Achaemenid Empire, chiefly from 499 to 449 BCE. The earlier wars supplied the grievance used to justify Alexander’s invasion of Persia.
Fall of the Achaemenid Empire: The collapse of Achaemenid rule following Alexander’s conquest of Persia in the late fourth century BCE. Gaugamela opened the route to Babylon, Susa, and Persepolis, accelerating that collapse.
Arrian: A Greek historian of the second century CE whose surviving work is a major account of Alexander’s campaigns. His narrative is a principal source for the battle’s sequence and commanders.
Darius III: The last Achaemenid king, who ruled Persia from 336 to 330 BCE. His flight from the field ended organized Persian resistance at Gaugamela.
League of Corinth: A federation of Greek states established under Macedonian leadership in 337 BCE. Its members formally backed the campaign against Persia that led to Gaugamela.
Battle of the Persian Gate: A 330 BCE battle in which Alexander’s forces defeated Persian defenders at a mountain pass. It was a final major obstacle after Gaugamela and before Alexander entered Persepolis.
Diodorus Siculus: A Greek historian of the first century BCE who wrote a universal history in forty books. His account preserves a distinct ancient narrative of Gaugamela and its aftermath.
Companion Cavalry: The elite Macedonian heavy cavalry that served as Alexander’s principal mounted striking force. Alexander led these horsemen through a gap toward Darius’s position.
Battle of Granicus: The 334 BCE battle in which Alexander defeated Persian forces in northwestern Asia Minor. This opening victory began the invasion that culminated at Gaugamela.

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