The wars of Alexander the Great were a series of conquests that were carried out by Alexander III of Macedon from 336 BC to 323 BC. They began with battles against the Achaemenid Persian Empire, then under the rule of Darius III of Persia. After Alexander's chain of victories against Achaemenid Persia, he began a campaign against local chieftains and warlords that stretched from Greece to as far as the region of Punjab in South Asia. At the time of his death, he ruled over most regions of Greece and the conquered Achaemenid Empire ; he did not, however, manage to conquer the Indian subcontinent in its entirety according to his initial plan. Despite his military accomplishments, Alexander did not provide any stable alternative to the rule of the Achaemenid Empire, and his untimely death threw the vast territories he conquered into a series of civil wars, commonly known as the Wars of the Diadochi.
Alexander, depicted with his horse Bucephalus, fighting Persian king Darius III, from the Alexander Mosaic of Pompeii (Naples National Archaeological Museum, Italy)
Hellenistic marble bust of Alexander dating from 2nd-1st century BC, possibly from Alexandria, Egypt, now at the British Museum
A naval action during the siege, Drawing by André Castaigne
Alexander Mosaic, showing Battle of Issus, from the House of the Faun, Pompeii
Darius III was the last Achaemenid King of Kings of Persia, reigning from 336 BC to his death in 330 BC.
Coin minted in by Cilicia by its satrap Mazaeus, portraying Artaxerxes III as pharaoh on the obverse, while a lion is depicted on the reverse
Darius III portrayed (in the middle) in battle against Alexander in a Greek depiction; Possible illustration of either Battle of Issus or Battle of Gaugamela
Darius's flight at the Battle of Gaugamela (18th-century ivory relief)