 Complete the following phrase:  Maximian staged a failed coup against Constantine and committed suicide in 310. A year later, Galerius and the retired Diocletian died, leaving Constantine, Licinius, Maxentius and Maximinus on the scene. Constantine and Licinius quickly reached an agreement recognizing each other as lawful rulers because their territories were separated by Maxentius realm. Constantine invaded Italy and defeated Maxentius 