Xerxes I

Xerxes’ administrative capabilities were immediately tested upon his accession. Egypt was in open revolt, driven by anger over high taxation and the forced deportation of its skilled craftsmen to work on Darius’s grand building projects at Susa and Persepolis. Rather than delegating the task, Xerxes personally led his army into Egypt, ruthlessly suppressing the rebellion by January 484 BCE. He installed his full brother, Achaemenes, as satrap to ensure tight imperial control, but the campaign had exhausted the military resources accumulated over three years.

Simultaneously, the vital province of Babylonia grew restless. Babylon, which had previously enjoyed a privileged status of "personal union" with the Persian crown—wherein the Achaemenid kings officially claimed the separate title of "King of Babylon"—revolted twice. The first uprising, led by Bel-shimanni in 484 BCE, lasted only two weeks. The second, under Shamash-eriba in 482 BCE, required a grueling multi-month siege of Babylon before it was broken in the spring of 481 BCE. Xerxes responded by dismantling the special status of the region. He dropped the title "King of Babylon" from his royal style, divided the massive Babylonian satrapy into smaller administrative units, and replaced the traditional local elites with loyal Persian families. While later Greek historians claimed Xerxes committed unspeakable acts of vengeance—such as destroying the great temple of Esagila and melting down the sacred golden statue of the god Marduk—modern historians suggest these accounts reflect later anti-Persian sentiments. It is more likely that if a statue was confiscated, it was that of a mortal man rather than the deity, though the traditional Babylonian New Year’s Festival was forever altered by the replacement of the city's ancient aristocracy.

With his empire stabilized, Xerxes turned his gaze toward the West. His father had died with the unfinished business of punishing Athens, Eretria, and Naxos for their role in the Ionian Revolt and the humiliating Persian defeat at Marathon. Though Xerxes was initially hesitant to commit the empire to a massive, distant war, his cousin Mardonius and other veteran generals urged him forward, casting any reluctance as timidity. What followed was one of the most meticulously planned military expeditions of antiquity. Starting in 483 BCE, Xerxes ordered the construction of a massive canal through the isthmus of Mount Athos to bypass a treacherous headland that had previously wrecked a Persian fleet. Provisions were amassed at strategic depots along the Thracian coast, and two immense pontoon bridges, woven from flax and papyrus, were constructed across the Hellespont. When a sudden storm tore these bridges apart, Xerxes’ public display of anger—the symbolic whipping of the waters—served as a theatrical demonstration of his absolute sovereignty over the natural world, a performance meant to terrify any who dared oppose him.

In the spring of 480 BCE, Xerxes marched out of Sardis. His force was a dazzling, polyglot mosaic of the ancient world. Under his banners marched Medes, Assyrians, Chaldeans, Phoenicians, Egyptians, Jews, and Arabs, alongside Bactrians, Saka, and even various Greek allies from Thessaly, Thrace, and the Aegean islands. At the core of this host were the Immortals, the elite ten-thousand-strong royal guard. While ancient Greek writers like Herodotus claimed this force numbered in the millions, modern estimates suggest a still-staggering combat force of roughly sixty thousand men.

The initial phases of the invasion went according to the Persian plan. At the narrow pass of Thermopylae, Xerxes’ overwhelming numbers eventually broke the desperate resistance of King Leonidas and his small Spartan-led coalition. With the gateway to central Greece open, the Persian army marched south, capturing and burning the evacuated city of Athens to avenge the burning of Sardis. Yet, the limits of Persian power were quickly reached in the narrow waters off the island of Salamis. There, the maneuverable Greek triremes devastated the crowded Persian fleet. Watching the disaster unfold from a golden throne erected on the slopes of Mount Aegaleos overlooking the strait, Xerxes realized his supply lines were in jeopardy. Fearing the Greeks might destroy his pontoon bridges and trap him in Europe, the King of Kings decided to withdraw the bulk of his army back to Asia Minor. He left Mardonius behind with a sizeable force to finish the conquest, but the following year, the Greeks decisively defeated Mardonius at the Battle of Plataea, effectively ending the grand Persian invasion.

Xerxes returned to his palaces, his ambitions of European expansion permanently checked, but his empire intact. For the remainder of his reign, he redirected his formidable energies and the wealth of his provinces into monumental architecture. He took up the unfinished masterpieces of his father, transforming the royal ceremonial capital of Persepolis into a breathtaking display of imperial majesty. Under his supervision, artisans completed the grand Apadana audience hall, the Tachara palace, and the magnificent Gate of All Nations, which welcomed emissaries from every corner of the known world with colossal stone bulls. He completed the Palace of Darius at Susa and maintained the vast Royal Road, ensuring that messages could still travel across his territories with unmatched speed.

The end of the King of Kings was not met on a grand battlefield, but in the dark corridors of his own palace. In 465 BCE, after a reign of twenty-one years, Xerxes and his eldest son and heir, Darius, were assassinated in a palace conspiracy led by Artabanus, the powerful commander of the royal bodyguard. The crown passed to his third son, who ascended the throne as Artaxerxes I.

Xerxes left behind an empire that, despite the catastrophic failure of the Greek expedition, remained the undisputed superpower of the Near East. The grand palaces he built at Persepolis and Susa stood for another century and a half as symbols of an administrative machine that could mobilize millions of people across continents. In the histories written by his enemies, Xerxes became a caricature of hubris, a cautionary tale of imperial overreach. But in the soil of Iran, where his monumental inscriptions still proclaim his devotion to the god Ahuramazda and his pride in his Aryan lineage, he remained what he was born to be: the keeper of the world’s greatest flame, a king who ruled over heroes, and the guardian of an empire that bridged the gap between East and West.