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Flavius Claudius Constantius Gallus (326 – 354) was a statesman and ruler in the eastern provinces of the Roman Empire from 351 to 354, as Caesar under emperor Constantius II (r. 337–61), his cousin. A grandson of emperor Constantius Chlorus (r. 293–306) and empress Flavia Maximiana Theodora, and a son of Julius Constantius and Galla, he belonged to the Constantinian dynasty. Wikipedia