Constantius I

orig. Flavius Valerius Constantius

(born c. 250, Dacia Ripensis—died July 25, 306, Eboracum, Britain) Roman emperor and father of Constantine I. A member of the tetrarchy (four-person ruling body) with his adoptive father Maximian, Diocletian, and Galerius, he was made caesar (subemperor) in the West (293–305) and later caesar augustus (senior emperor; 305–306). As ruler of Gaul, he subdued rebellion in Britain (296), ended piracy, restored the frontier, and largely ignored edicts against Christians. (Constantius's nickname Chlorus, meaning “The Pale,” is first found in Byzantine sources.)

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