Cleisthenes 508 BCE, restored by Ephialtes 460 BCE and cemented
by Pericles after Ephialtes' assassination.
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Otus, Ephialtes' twin brother killed him on accident. They were
distracted by Artemis, and they threw their javelins and was
speared by each other. They then died.
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Ephialtes was the twin of Otus, they were Giant twins, and the
sons of Poseidon and Iphimedia (or Canace). They were killed
accidentally by each other's javelins and the cunning of
Artemis.