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Galerius Valerius Maximianus, commonly known as Galerius, was a Roman emperor who ruled from 305 to 311 AD. He was one of the four rulers of the tetrarchy, a system of power-sharing established by Diocletian. Galerius was a skilled military leader and played a crucial role in securing the empire's frontiers. He is remembered for his persecution of Christians, which culminated in the Great Persecution of 303-311 AD.