The Battle of Gaugamela (/ˌɡɔːɡəˈmiːlə/; Ancient Greek: Γαυγάμηλα, romanized: Gaugámela), also called the Battle of Arbela (Ancient Greek: Ἄρβηλα, romanized: Árbela) took place in 331 BC between the forces of the Army of Macedon under Alexander the Great and the Persian Army under King Darius III. It was the second and final battle between the two kings, and is considered to be the final blow to the Achaemenid Empire, resulting in its complete conquest by Alexander.