Plutarch's life of the last great king of Sparta, who seized sole power to force a radical land-and-debt revolution, lost everything at the battle of Sellasia, and died in a failed uprising as a hostage in Ptolemaic Egypt.
Cleomenes III inherited a Sparta hollowed out by wealth and idleness, its ancient discipline all but gone. Ambitious and philosophically trained under the Stoic Sphaerus of Borysthenes, he modeled himself on the reformer-king Agis (whose widow he married) and set out to restore the old Lycurgan order by force: he killed the ephors who blocked reform, canceled debts, redistributed land, enrolled new citizens as hoplites, and stripped the court of luxury, making his own frugal table and plain dress the model for the whole army.
The narrative then follows Cleomenes' wars against the Achaean League and its leader Aratus, an escalating conflict over the Peloponnese that brings Cleomenes to the gates of Corinth and Argos and forces the Achaeans to buy Macedonian intervention under Antigonus Doson. Family loss, a captured Argos, and a decisive shortage of money against a wealthier enemy culminate in the battle of Sellasia, where Cleomenes' outnumbered Spartans are crushed; Plutarch marks the razor-thin timing by which two more days would have spared him the fight entirely.
Defeated, Cleomenes flees to Ptolemaic Alexandria, where he is honored, then neglected, then effectively held hostage as Egyptian court intrigue turns against him. Refused ships and troops to relaunch his cause, he attempts a desperate, doomed uprising with a handful of companions and dies by suicide alongside them rather than be recaptured. Plutarch closes with the harrowing fate of his mother, wife, and children, executed in Alexandria, framing Cleomenes as history's last attempt at genuine Spartan renewal, undone as much by fortune and money as by Macedonian arms.
“she said, "Come, king of the Lacedaemonians, let no one, once we are outside, see us weeping or doing anything unworthy of Sparta. For this alone is in our power; as for fortunes, they come as the god gives them."”
— Cleomenes
“But fortune, which decides the greatest of affairs, showed by a hair's breadth such a weight and power in timing that, the battle at Sellasia having taken place and Cleomenes having lost his army and his city, immediately afterward those summoning Antigonus arrived.”
— Cleomenes
“For if he had held back only two days and put off the fight, avoiding battle, he would not have needed to fight at all, but could have come to terms on his own conditions with the Achaeans once the Macedonians had departed.”
— Cleomenes
“So then, giving up, he said to his friends, "It was no wonder, then, that women should rule over men who flee from freedom," and he called on them all to die in a manner worthy of himself and of what they had done.”
— Cleomenes
“So Lacedaemon, having contended on equal terms in this drama of women against that of men, showed in its last extremities that valor could not be outraged by fortune.”
— Cleomenes
Cleomenes III was king of Sparta in the third century BCE who seized sole authority, killed the ephors who opposed him, and pushed through a sweeping social revolution: canceling debts, redistributing land, and enrolling new citizens as hoplites. Plutarch presents him as the last serious attempt to restore the old Lycurgan discipline before Sparta's final decline.
Cleomenes' military successes against the Achaeans under Aratus threatened to make Sparta the dominant power in the Peloponnese. Aratus, unwilling to accept Spartan-led terms, ultimately invited the Macedonian king Antigonus Doson into Greece to check Cleomenes, converting a regional rivalry into an existential war for Sparta.
At Sellasia, Cleomenes' outnumbered and underfunded Spartan force was defeated by Antigonus's larger, better-equipped Macedonian-led army. Plutarch stresses that a two-day delay would have let Cleomenes negotiate from strength instead of fighting at all, making the loss a matter of timing and money as much as generalship.
After fleeing to Ptolemaic Alexandria, Cleomenes was honored briefly, then sidelined and effectively confined as Egyptian court politics turned against him. Refused the ships and troops he needed to resume his cause, he led a small, hopeless uprising in the city and, when it collapsed, died by suicide with his companions rather than be taken.
His mother Cratesicleia had earlier gone to Alexandria as a hostage to secure Ptolemaic support, taking his children with her. After his death, Ptolemy had his mother, wife, children, and the wife of his companion Panteus executed; Plutarch gives special attention to the composed, deliberate death of Panteus's wife.
Cleomenes is described as having studied under the Stoic philosopher Sphaerus of Borysthenes in his youth, which Plutarch connects to his disciplined, austere style of kingship and his conviction that Sparta's troubles stemmed from moral softness as much as institutional decay.
Cleomenes is paired with a Roman revolutionary reformer as part of Plutarch's scheme of matching Greek and Roman lives; within the Spartan sequence it also directly continues the story of Agis, the earlier reforming king whose widow Cleomenes married and whose program he tried to complete.
Plutarch explicitly says Cleomenes, lacking funds, was forced to risk everything in a single battle rather than sustain a longer campaign, while Antigonus could draw on Macedonian wealth. The comparison of trained but poor athletes against wealthier rivals is used directly to explain the military outcome.
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