From Harpokration (and Photius) s.v. Hyperbolos -- but the Suda mss do corrupt the name to Hyperboros (and observe the alphabetical order of the corrupted version). For the real thing see under upsilon 245.
[1] Thucydides 8.73.3 (web address 1). For ostracism see generally omicron 716, omicron 717.
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