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Hiero I (/ˈhaɪəroʊ/; also Hieron /ˈhaɪərɒn/; Ancient Greek: Ἱέρων) was the son of Deinomenes, the brother of Gelon and tyrant of Syracuse in Sicily, from 478 to 467 BC.[1] In succeeding Gelon, he conspired against a third brother, Polyzelos.