This is the second volume in an ambitious series giving the reader a comprehensive narrative of late Roman military history from AD 284-641. Each volume (5 are planned) gives a detailed account of the changes in organization, equipment, strategy and tactics among both the Roman forces and her enemies in the relevant period, while also giving a detailed but accessible account of the campaigns and battles. This volume covers the tumultuous period from the death of Constantius II in AD 361 to the death of Theodosius. Among the many campaigns covered, it therefore includes the Emperor Julians fatal campaign against the Sassanian Persians and the disastrous defeat and death of Valens at Adrianople in 378. Such calamities illustrate the level of external threat Romes armies faced on many fronts in this difficult period. AUTHOR: Dr Iilkka Syvanne gained his doctorate in history in 2004 from the University of Tampere in his native Finland. Since then he has written extensively about ancient and medieval warfare and his publications include: The Age of Hippotoxotai, Art of War in Roman Military Revival and Disaster 491-636 (Tampere UP 2004), the multi-volume Military History of Late Rome published by Pen & Sword, the critically acclaimed Caracalla: A Military Biography and many other imperial biographies, the most recent of which is Emperor Septimius Severus, The Roman Hannibal, also published by Pen & Sword. He was Vice Chairman of the Finnish Society for Byzantine Studies from 2007 until 2016. He was appointed as an Affiliated Professor of the University of Haifa in 2016. He lives in Kangasala, Finland.