The Caesar Constantine took the title Augustus in the West in 307 without the consent of the East. Before the East also recognized him as Augustus he was awarded the ephemeral imperial title Filius Augusti, "Son of the Augusti." "FIL AVG" and "FIL AVGG" appear only on coins of Constantine and Maximinus II, and, because both rejected the title, only on coins issued in their names from mints they did not control. The story begins in the context of the tetrarchic system in July 306 when the western Augustus Constantius I, terminally ill, gave his son Constantine imperial power. It ends in mid 310 when events forced the eastern Augustus Galerius to recognize Constantine and Maximinus II as Augusti. Coins illustrate the complicated power struggle during these four years.