I. Abteilung Jakub Hendzel The reconquest of Dacia by Constantine the Great Abstract: The article discusses some particulars of Constantine the Great’s cam- paigns waged in the years 329 – 336 in the Danube area against the Goths and the Sarmatians, with a special focus on the Roman reconquest of Dacia, a former province abandoned during the reign of Aurelian. The corpus of analysed sources encompasses a selection of relevant literary and historical sources, supplemented with archaeological, numismatic and epigraphic sources. One of the aims of this article is to improve our understanding of Constantine’s reconquest of Dacia, an event hitherto insufficiently explored by modern historians. In the aftermath of these military operations, the Romans recovered areas of former Dacia Malvensis and Dacia Apulensis, lost half a century earlier; however, most of these ephemeral gains were lost a mere decade (at the very latest) after the death of Constantine the Great. Adresse: Jakub Hendzel, Department of Classical Philology, Faculty of Philology, University of Łódź, Pomorska 171/173, Room 4.49, 90 – 236 Łódź,Poland; jakub.hendzel@edu.uni.lodz.pl Introduction Constantine the Great (306 – 337 CE), best remembered today as the first Christian emperor of the Roman Empire, achieved fame in his day as an excellent military commander, having won many victories over enemies within and without. One of his less known military operations turned against the Goths and Sarmatians to re- I would like to express my warmest thanks to Vasile Mărculeț and Timothy Hart, who shared many pub- lications with me. I am also very grateful to Eric Charles De Sena and the anonymous BZ reviewers for their valuable comments. DOI 10.1515/bz-2023-0001 BZ 2023; 116(1): 1–52