Galerius (Gaius Galerius Valerius Maximianus, ~250 – 5 May 311), was Roman Emperor from 305 to 311.
Galerius served as a soldier with distinction. When the Tetrarchy was introduced by Diocletian in 293 Galerius and Constantius Chlorus were given the rank of Caesar. Galerius married Diocletian's daughter Valeria, and took over the Illyrian provinces.
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