Political Networks, Imperial Relations, and the Division of the Roman Empire, AD 337 to 350
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Political Networks, Imperial Relations, and the Division of the Roman Empire, AD 337 to 350 PhD thesis, December 2019 William Lewis Abstract This thesis argues that the years AD 337 to 350 gave rise to a series of events that prompted one of the earliest and most influential territorial divisions of the Later Roman Empire. Following the death of Constantine the Great, his sons, Constantine II, Constantius II, and Constans, arranged to share power. But a failure of imperial collegiality, culminating in the civil war of 340, led to the empire being divided into autonomous and sovereign states. Following the period of the Tetrarchy, this established a new precedent for how the empire was governed, which eventually became permanent in 395 after the death of Theodosius I. The importance of this first division has been overlooked in scholarship, and this thesis will establish when, how, and why the Roman Empire was divided by the sons of Constantine. This thesis is arranged in the following way. Chapter 1 introduces the thesis, provides an overview of scholarship and the available evidence, establishes a definition of division, and summarises the structure of the thesis. Chapter 2 examines the succession arrangements of Constantine and how they were overturned by Constantius, before considering the negotiations between the sons and their acclamation as Augusti. Chapter 3 reconstructs the governance of the empire from 337 to 340, and demonstrates that there was still a functional imperial hierarchy and undivided empire, even though the authority of Constantine II was beginning to be eroded. Chapter 4 re-examines the conflict between Constantine II and Constans in 340, and argues that the accepted narrative of Constantine II’s aggression is false, and that Constantine II was ambushed on the initiative of Constans. This fatally undermined imperial collegiality and hierarchy, which resulted of the de facto division of the empire between the surviving brothers, Constantius and Constans. Chapter 5 uses prosopography to examine how the newly divided empire functioned, focusing on the praetorian prefecture, the consulship, and the relationship between imperial courts. Chapter 6 looks at the assassination of Constans and its aftermath, which demonstrates how division had become an established part of the imperial administration, and it was only the efforts of Constantius that caused its temporary reunification. Chapter 7 considers Constantius’ attempts to preserve unity in the 350s, and his ultimate failure to address the expectation of division among the army and administration. This chapter concludes the thesis by showing that the division of the Roman Empire from 340 to 350 had become too entrenched to be reversed, and that the precedent established in these years led to the permanent division of the Roman Empire. ii Contents List of Abbreviations vi List of Figures viii Acknowledgements ix Chapter 1: Introduction: Partes Regendae 1 Preface 1 2 Historiographical Context 5 3 Literature Review 11 4 Evidence and Sources 15 5 Defining and Approaching Political Networks, Imperial Relations, and the Division of the Roman Empire 25 6 Thesis Structure 31 7 Conclusion 33 Chapter 2: Constantius, Divider of Empires? The unified empire of Constantine and the rebellion of Constantius in AD 337 1 Introduction 35 2 Constantine’s Executor 37 3 Negotiations in Pannonia 48 4 A Detour to Troesmis 49 5 Mutiny 55 6 Conclusion: The Post-Tetrarchy of Constantius 58 Chapter 3: The Constantinian Triarchy Imperial collegiality and regional autonomy in a loosely unified empire, AD 337 to 340 1 Introduction 61 2 Territory 62 3 Authority 64 4 Legislative Autonomy 69 5 Seniority 76 iii 6 Conclusion 80 Chapter 4: The Civil War of 340 Conspiracy, culpability, and consequence 1 Introduction 82 2 The Sources for the Civil War of 340 84 3 Date and Distance Analysis 93 4 Constans’ Coup 100 5 The Reaction of Constantius 103 6 Conclusion 111 Chapter 5: Ulpius Limenius and the West Political mobility, regional administration, and the consulship: governing a divided empire, AD 340 to 350 1 Introduction 113 2 The Proconsul of Constantinople 116 3 Praetorian Prefects in the West 121 4 Constans’ Eastern Court 133 5 The Consulship 136 6 Conclusion 153 Chapter 6: Fabius Titianus and the Urban Prefecture of Rome High-status officials, the fall of Constans, and the future of dynastic division 1 Introduction 158 2 The Chronography of 354 161 3 Constans’ Urban Prefects 169 4 The Profile of the Urban Prefecture Under Constans 176 5 The Fight for Rome 183 6 Fabius Titianus: praefectus iterum 190 7 A Conspiracy of Constans’ Supporters 194 8 Usurpation in a Divided Empire 200 9 Conclusion 203 iv Chapter 7: Conclusion: Constantius, Unifier of Empires 1 Introduction 206 2 The Years 337 to 350, Revisited 208 3 Constantius and the Reunification of the Roman Empire 211 4 Conclusion 222 Appendix 1: The Constantinian Family Tree 224 Appendix 2: Constantia and Orfitus 225 Appendix 3: A Digression on Julian’s Second Oration 232 Bibliography 236 v List of Abbreviations Amm. Ammianus Marcellinus Rerum Gestarum App. B. Civ. Appian The Civil Wars Art. Pass. Artemii Passio Athan. Athanasius Apol. ad Const. Defence before Constantius Apol. c. Ar. Defence against the Arians Apol. de fuga Defence of his Flight Hist. Ar. History of the Arians Aug. Conf. Augustine Confessions Aur. Vict. Aurelius Victor De Caesaribus CAH Cambridge Ancient History CIL Corpus Inscriptionum Latinarum CLRE Bagnall, R. S., A. Cameron, S. R. Schwartz, and K. A. Worp 1987: Consuls of the Later Roman Empire, Atlanta: Scholars Press. CTh Codex Theodosianus COD Concise Oxford Dictionary (Twelfth Edition) Eunap. VS Eunapius Vitae Sophistarum Eus. Eusebius HE Historia Ecclesiastica VC Vita Constantini Firm. Mat. Math. Firmicus Maternus Mathesios libri VIII ILS Inscriptiones Latinae Selectae Jer. Chron. Jerome Chronicle Jul. Julian Ad Ath. Letter to the Athenians Caes. Caesars Ep. Epistlulae Mis. Misopogon Or. Orationes Lact. Mort. Pers. Lactantius On the Deaths of the Persecutors LSA Last Statues of Antiquity Lib. Libanius vi Ep. Epistulae Or. Orationes Or. Const. Letter of the Emperor Constantius to the Senate Concerning Themistius Oros. Orosius History against the Pagans Pan. Lat. Panegyrici Latini Pet. Patr. fr. Petrus Patricius fragments Phot. Epit. Photius Epitome of the Ecclesiastical History of Philostorgius Philost. HE Philostorgius Ecclesiastical History PLRE 1 Jones, A. H. M., Martindale, J., and Morris, J. 1971: The Prosopography of the Later Roman Empire Vol. 1, A.D.260-395, London: Cambridge University Press. RIC VII Bruun, P., with R. A. G. Carson and C. H. V. Sutherland (eds.) 1966: Roman Imperial Coinage Vol. VII: Constantine and Licinius, A.D. 313- 337, London: Spink & Son. RIC VIII Kent, J. P. C. 1981: The Roman Imperial Coinage Vol. VIII: The Family of Constantine I A.D. 337- 364, London: Spink & Son. Ruf. HE Rufinus Ecclesiastical History Soc. HE Socrates Scholasticus Ecclesiastical History Soz. HE Sozomen Ecclesiastical History Suet. Suetonius Vit. Tib. Life of Tiberius Vit. Vitell. Life of Vitellius Symm. Symmachus Ep. Epistulae Or. Orationes Tac. Ann. Tacitus Annales Them. Or. Themistius Orationes Theod. HE Theodoret Ecclesiastical History Zon. Zonaras Epitome Historiarum Zos. Zosimus Historia Nova vii List of Figures Figure 1: The territories of Constantine’s Caesars from 335 to 337 37 Figure 2: The Troesmis inscription 51 Figure 3: The territories of the sons of Constantine as Augusti, from 337 to 340 62 Figure 4: Gold glass depicting Orfitus and Costantia 226 Figure 5: Hypothetical marriage relations of Memmius Vitrasius Orfitus 229 viii Acknowledgements My thanks go first and foremost to my supervisor, Nic Baker-Brian, who encouraged me to approach this thesis in my own way, while providing a limitless supply of ideas, insight, good advice and scholarly wisdom, and without whom this thesis would never have been possible. My thanks also go to my second supervisor Richard Flower, to my friends and family for their tolerance and support, to the SWW DTP for funding the whole enterprise, and to Alexander Gordon for keeping it afloat. I would like to dedicate this thesis to the memory of Uncle Dave and Grandma, who were lost along the way. ix Chapter 1 Introduction: Partes Regendae 1.1 PREFACE This is the story of how the Roman Empire was divided by accident. It is the story of how a great realm was cleaved in two, because of dynastic principles, imperial relations, and the evolving politics of multiple rule. It is a story that has been overlooked in scholarship, and its true significance was unknowable at the time. But the division of the Roman Empire is a story that still affects the world today. It contributed to the fall of the Roman Empire in the West, and the development of national boundaries and identities that have often persisted into the present.1 It determined the culture and institutions of the Byzantine Empire.2 It set the stage for the divergent worlds of Medieval Europe and the Byzantine and Ottoman East. It spelled the end to a kind of unity around the Mediterranean that has never since re-emerged, the absence of which is still felt in the politics and discourse of modernity. Arguably, it was one of the most consequential single events in world history. But when did it happen? Conventional wisdom says 395,3 when the empire was divided between the two successors to Theodosius I, Arcadius in the East and Honorius in the West. But there was not just one division of the Roman Empire. In fact, it was divided multiple times, and in many different ways, before the division became largely permanent with the accession of Arcadius and Honorius.4 Multiple emperorship had a long history, and had become commonplace after 1 It is perhaps unsurprising that many modern national identities are defined in opposition to the Roman Empire, rather than as descendants of it.