page_title: German and Sarmatian campaigns of Constantine
section_title: Results
hierarchical_section_title: German and Sarmatian campaigns of Constantine / Results
caption_attribution_description: English: Roman World at the time of Constantine the Great Italiano: Il mondo romano al tempo di Costantino il Grande
context_page_description: The German and Sarmatian campaigns of Constantine were fought by the Roman Emperor Constantine I against the neighbouring Germanic peoples, including the Franks, Alemanni and Goths, as well as the Sarmatian Iazyges, along the whole Roman northern defensive system to protect the empire's borders, between 306 and 336.
  After becoming controller of the western provinces along the Rhine limes following the death of his father Constantius Chlorus in 306, Constantine initially concentrated his forces on defending this area of the frontier against the Franks and Alemanni, making Augusta Treverorum his first capital for this purpose. Having defeated the usurper Maxentius at the Battle of the Milvian Bridge in 312, all Italia passed under Constantine's control and he thus became the sole Augustus of the West.
  In February 313, Constantine formed an alliance with the Emperor of the East, Licinius, reinforced by Licinius' marriage to Constantine's sister, Flavia Julia Constantia. However, this alliance survived for only a few years, before the two Augusti came into conflict in 316. Constantine defeated Licinius, who was forced to cede Illyricum to Constantine, but not Thrace.
context_section_description: The equilibrium along the lower course of the Danube, after all the campaigns of Constantine and his sons, remained almost unchanged until around 375. The focus of the Emperor turned to the east, where a series of preparations were made for an imminent military campaign against the Sassanids, which was never carried out by Constantine on account of his death in May 337. For twenty five years, the Roman armies of Constantius II and then Julian, fought against the Sassanid armies with varying success (337–363). However the Lower Danube and Eastern borders remained, for almost thirty years, practically unchanged.
caption: The northern and eastern frontiers of the Roman Empire in the time of Constantine, with the territories acquired in the course of the thirty years of military campaigns between 306 and 337.
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