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Flavius Valerius Constantius, known as Constantius Chlorus, was a Roman emperor who ruled from 305 to 306. He was the father of Constantine the Great. Constantius's full name reflects the Roman naming conventions of the time, with his first name (Flavius) indicating his family, his second name (Valerius) indicating his clan, and his third name (Constantius) being his personal name.