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Bibulus (Marcus Calpurnius Bibulus) (bĬb´yŏŏləs), d. 48 BC, Roman statesman. The colleague in the consulship with Julius Caesar in 59 BC, he did everything in his power to block each move made by Caesar. A conservative republican, he was a strong partisan of Pompey. In 51 BC he was governor of Syria, and in 48 BC he died trying to halt Caesar in the Adriatic. His wife was Portia, daughter of Cato the Younger; she later married Brutus.