Cethegus may refer to:
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''Cethegus'' (spider), a spider genus
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Cornelii Cethegi, an ancient Roman family
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Rufius Petronius Nicomachus Cethegus
Rufius Petronius Nicomachus Cethegus was a politician of Ostrogothic Italy and the Eastern Roman Empire. He was appointed consul for 504 AD, and held the post without a colleague. His father was Petronius Probinus, the consul for 489 and prominent ...
, Roman senator
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