Roman Army: Late Empire

In this episode, we explore the transformation of the Late Roman army beginning with the reforms of Diocletian in CE 284, placing these changes within the broader struggle to preserve imperial stability during a period of crisis. The discussion traces the shift away from the traditional legions of the Principate toward a more complex military structure that separated mobile field armies from permanently stationed border forces, reflecting new strategic and administrative priorities. We examine the pressures driving these reforms, including economic inflation, manpower shortages, and the growing dependence on barbarian-born soldiers, as well as technological adaptations such as the adoption of the spatha and reinforced helmets. The episode also considers debates over Roman grand strategy, particularly whether the empire relied on defense-in-depth or forward defense, and concludes by contrasting the relative resilience of the Eastern Roman forces with the gradual collapse of the Western army.