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Aristonicus (Latin; Greek "Aristonikos") was a eunuch of Ptolemy V Epiphanes. He was brought up with the king from his early youth. Polybius speaks of him in terms of high praise, as a man of a generous and warlike disposition, and skilled in political transactions. In 185 BC, when the king had to fight against some discontented Egyptians, Aristonicus went to Greece and engaged a body of mercenaries there.