When Augustus (63 BCE-14 CE) became the ruler of the Roman Empire, fully 200 years of peace called Pax Romana commenced. The Romans built networks of good roads and aqueducts for supplying water. Unfortunately, in the third century CE the ordered civilization of the Pax Romana ended. The Roman Empire was plunged into military anarchy. German tribesmen from Vistula river broke through the deteriorating border defenses to raid, loot, and destroy.