Achaemenid Empire
In 550 BC, Cyrus the Great defeated the Median king Astyages and captured Ecbatana. This single event marked the birth of an empire that would stretch from the Balkans to the Indus Valley. Before this moment, Persians lived as nomadic pastoralists in a region called Persis on the Iranian plateau. They had no claim to rule over vast territories or diverse populations.
Cyrus moved quickly after securing Media. He turned his attention to Lydia, where King Croesus sought to expand into former Median lands. The Persian counterattack crushed Lydian forces and led to the capture of Sardis in 546 BC. A rebellion by Pactyes required four years of fighting before Mazares and Harpagus restored order across Asia Minor.
Hostilities with Babylon erupted around 539 BC. Cyrus won a battle at Opis and took Sippar without resistance. On the 12th of October, he entered Babylon itself, taking King Nabonidus prisoner. Propaganda declared him a restorer of divine order who honored Marduk rather than Sin. This narrative helped secure loyalty among Babylonian priests and people.
Cambyses II succeeded Cyrus in 530 BC and pushed southward. By 525 BC, Pharaoh Psamtik III stood at Pelusium in the Nile Delta. His army fell to Persian forces, and he fled to Memphis before committing suicide. Egypt became part of the empire, though Herodotus later claimed Cambyses lost his mind after killing the sacred bull Apis.
Archaeological evidence contradicts claims of total madness. An epitaph from 524 BC shows Cambyses participating in funeral rites for Apis while styling himself as pharaoh. He established garrisons like Elephantine, where Jewish soldiers remained stationed throughout his reign. The expedition into Ethiopia may have failed due to supply issues, but a fortress at the Second Cataract stayed in use for centuries.
The Ionian Revolt began in 499 BC when Aristagoras, tyrant of Miletus, incited Greek cities against Persian rule. A joint expedition to conquer Naxos had failed, leaving him vulnerable to removal. He chose rebellion instead, hoping to bolster his position financially and politically.
Darius I vowed to punish Athens and Eretria for supporting the revolt. In 490 BC, Persian forces landed near Marathon and faced Athenian hoplites. The battle ended with a decisive defeat for Persia, and Darius died before launching another invasion of Greece.
Xerxes I took up the mantle of conquest. His army entered Greece in spring 480 BC, moving through Macedonia and Thessaly without resistance. At Thermopylae, a small Greek force delayed them for three days. Simultaneously, the naval Battle of Artemisium saw storms destroy ships from both sides before Greeks retreated upon hearing news of Thermopylae's fall.
Salamis followed in 480 BC, where Greek fleets won a decisive victory over the Persian navy. Xerxes retired to Sardis, leaving Mardonius with land forces. These troops retook Athens but were destroyed at Plataea in 479 BC. The final defeat at Mycale encouraged Ionian revolts once more, stripping Persia of all European territories except Thrace.
Artabanus assassinated Xerxes with help from Aspamitres, a eunuch. The exact date remains disputed among historians. Subsequent kings like Artaxerxes I adopted strategies to weaken Athens by funding its enemies indirectly. This approach caused the Delian League treasury to move from Delos to the Athenian acropolis.
Peace of Callias emerged in 449 BC between Athens, Argos, and Persia. Artaxerxes offered Themistocles asylum after his ostracism from Athens. He granted Magnesia, Myus, Lampsacus, Palaescepsis, and Percote to support him in bread, meat, wine, clothes, and bedding.
Cyrus founded a multi-state empire governed from four capitals: Pasargadae, Babylon, Susa, and Ecbatana. Regional autonomy existed through satrapies, administrative units organized geographically. Each satrapy had a governor called a satrap who administered the region.
A general supervised military recruitment while ensuring order. A state secretary kept official records. Both reported directly to the satrap and the central government. At varying times, there were between 20 and 30 satrapies across the vast territory.
Herodotus observed that nothing traveled faster than these Persian couriers. Snow, rain, heat, or night gloom never stopped them from completing their rounds. This system allowed rapid transmission of information across continents.
Royal inspectors toured the empire as eyes and ears of the king. They reported on local conditions to ensure compliance with tax laws and loyalty to the throne. The Persepolis Fortification Archive contains over 10,000 cuneiform documents dating from 509 to 457 BC.
These tablets reveal details about daily operations including camel keepers and grain distributions. Aramaic appears in about 1,000 original records alongside Elamite texts. Only one tablet in Old Persian has been identified so far.
Cyrus created a professional army consisting of three infantry groups: Immortals, Sparabara, and Takabara. Later years added Cardaces as a fourth unit. The Immortals remained constantly at exactly 10,000 men strong.
Every killed, wounded, or sick member
was immediately replaced by a new recruit. This custom maintained cohesion and numbers throughout campaigns. They carried wicker shields, short spears, swords, daggers, bows, and arrows beneath scale armor coats.
Spear counterbalances were silver for common soldiers but golden for officers. Surviving colored glazed bricks show elaborate robes worn only during ceremonial occasions. Sparabara formed shield walls using two-meter-long spears to protect archers from enemy attacks.
Trained from childhood, they practiced hunting on vast plains when not campaigning. During quiet periods, they returned to farming land and grazing herds. Their quilted linen armor and rectangular wicker shields offered light maneuverable defense against most opponents.
Composite bows adopted from Scythians became standard equipment. Leaded tin-bronze arrowheads allowed mass production unlike individually forged wrought iron versions. Cavalry included chariot archers, horse cavalry, camel cavalry, and war elephants introduced later.
Chariot archers used lances, bows, arrows, swords, and scale armor. Horses wore matching protection similar to Sassanian cataphracts. Camel cavalry first appeared under Cyrus at the Battle of Thymbra.
Zoroastrianism became the de facto religion during Artaxerxes I's reign. Elamite ceased being the language of government while Aramaic gained importance. The solar calendar likely emerged as the national system around this time.
Artaxerxes II moved the
capital back to Persepolis, greatly extending it. Summer residence at Ecbatana received gilded columns and silver or copper roof tiles. Extraordinary innovations in Zoroastrian shrines dated to his period spread from Armenia through Asia Minor and the Levant.
Temples served dual purposes: religious worship and income generation. Mandatory temple taxes required one-tenth tithe payments from all inhabitants nearest their land or another income source. This practice ensured steady funding for religious institutions.
Multilingual administration reflected diversity across territories. Old Persian, Elamite, Akkadian, and Aramaic coexisted in official records. Inscriptions on royal rock faces always accompanied Elamite texts with translations into other languages.
Religious tolerance policies allowed subject peoples to maintain their own beliefs. Jews received authorization to reconstruct Jerusalem including the Second Temple after exile. Phoenicians, Egyptians, Greeks, and others retained cultural identities under Persian rule.
Darius III ascended the throne after Bagoas poisoned Artaxerxes IV Arses. Previously Satrap of Armenia, Darius forced Bagoas to swallow poison himself. In 334 BC, Alexander invaded Asia Minor when Darius was subduing Egypt again.
Granicus fell
in 334 BC followed by Issus in 333 BC. Gaugamela ended in 331 BC as the final major battle. Alexander marched on Susa and Persepolis which surrendered before burning early in 330 BC.
From Persepolis, he traveled north to Pasargadae visiting Cyrus's tomb. Most luxuries had been looted during chaos created by invasion. Alexander questioned Magi about treatment of the tomb and put them on trial.
His decision may have undermined Magian influence rather than showing genuine concern for Cyrus. He ordered Aristobulus to restore interior conditions displaying respect for the founder. Darius III sought refuge at Ecbatana but was captured by Bessus, his Bactrian satrap.
Bessus murdered Darius and declared himself Artaxerxes V before retreating into Central Asia. Alexander brought the body to Persepolis for honorable funeral execution. Bessus formed coalitions defending against Macedonian advance until found and executed cruelly.
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Common questions
When did Cyrus the Great defeat Astyages and capture Ecbatana to establish the Achaemenid Empire?
Cyrus the Great defeated Median king Astyages and captured Ecbatana in 550 BC. This event marked the birth of an empire that stretched from the Balkans to the Indus Valley.
What happened during the Persian invasion of Egypt under Cambyses II in 525 BC?
Persian forces defeated Pharaoh Psamtik III at Pelusium in 525 BC, leading to his flight to Memphis and subsequent suicide. Egypt became part of the Achaemenid Empire while garrisons like Elephantine remained stationed there throughout his reign.
How many satrapies existed within the Achaemenid Empire and what was their administrative structure?
There were between 20 and 30 satrapies across the vast territory at varying times. Each satrapy had a governor called a satrap who administered the region with oversight from royal inspectors and state secretaries.
Which battles ended the Greco-Persian Wars and when did they occur?
The naval Battle of Artemisium occurred in spring 480 BC followed by the decisive Greek victory at Salamis later that same year. The final defeat for Persia came at Plataea in 479 BC after troops retook Athens but were destroyed.
When did Alexander the Great capture Persepolis and what happened to Darius III?
Alexander marched on Susa and Persepolis which surrendered before burning early in 330 BC. Darius III sought refuge at Ecbatana but was captured by Bessus, his Bactrian satrap, who murdered him and declared himself Artaxerxes V.