Germanic Saxons continue raiding the Roman controlled coasts of Britain.  By 300, the Romans had finished their nine seashore forts, had a river wall for London and had fortified York.  Various Roman generals were ruling different parts of the empire and fighting amongst themselves for control.  Constantine I and Licinius eventually took control of the West and the East of the empire respectively and permitted the toleration of Christianity.  Constantine I and Licinius began to battle each other for supremacy of the empire while battling Gothic invaders.  Constantine I eventually won supremacy by the end of this quarter-century.  In India, the new ruler Chandragupta I of Magadha began to extend his kingdom westward.

Notable Battles
312 Battle of Mulvian Bridge between Constantine I and Maxentius.
313 Battle of Tzurulum between Licinius and Maximinus.
323 Battles of Adrianople and Hellespont between Constantine I and Licinius.
323 battle of Chrysopolis between Constantine I and Licinius.