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Around 490 BC Cleomenes was forced to flee Sparta when his plot against his co-king Demaratus was discovered, but the Spartans allowed him to return when he began gathering an army in the surrounding territories. However, according to Herodotus he was by this time considered to be insane. The Spartans put him in prison. By the command of his half-brothers, Leonidas I and Cleombrotus, Cleomenes was placed in chains.