This research examines how, when and why the Romans assigned and defined the tasks of preparing and commanding fleets during the Republic. In doing so, it brings new evidence to bear on the wider debates about the nature of the prouincia and the institutional and administrative development of the Roman empire. The communis opinio is that a prouincia originally represented a functional “sphere of operation” that was allotted or assigned to a magistrate and that it only later developed a geographical meaning with territorial connotations through the process of “provincialisation.” This research challenges that view through an analysis of the evidence for the definition, assignment and practical use of the prouincia classis and other prouinciae connected with the command of fleets. Drawing upon and analysing the lists of administrative arrangements to be found in the “annalistic” sections of the surviving books of Livy’s History, it argues that prouinciae were defined in specific geographical and functional terms long before the development of permanent territorial empire. This offers a new perspective which points to and elucidates the flexible use of the prouincia as a means of separating magistrates and promagistrates in space or by function in space. It argues that the rationale for this was to limit conflicts between commanders over command and triumphal rights. By combining evidence from a wide range of sources after the loss of Livy’s History from 167, the research shows that the above rationale for demarcating prouinciae still applied in the first century B.C. However, it also demonstrates that there were significant changes with the assignment of vast Mediterranean-wide naval prouinciae in the first half of the first century B.C. It argues that the definition of these prouinciae was made possible by the development of a singular collective Mediterranean-wide ora maritima, which was brought about by the Romans’ increasing “acknowledgement of empire.” The negative political and institutional implications of these developments are also assessed. Finally, in discussing the above, this research also provides new insights into the role and auctoritas of the Senate, the function and freedom of magistrates, and the Romans’ conceptualisation of their empire.

Augustodunum, civitas Aeduorum, fondée à l’époque augustéenne, fut dotée de quatre portes urbaines : la porte d’Arroux et la porte Saint-André qui sont les mieux conservées, la porte Saint-Andoche dont il ne reste qu’une tour de flanquement et la porte de Rome, depuis longtemps disparue. L’étude stratigraphique du bâti des portes et la réflexion sur le fonctionnement du chantier de construction des portes urbaines d’Autun constituent le cœur de ce travail. Par ailleurs, antiquaires, voyageurs et artistes ont laissé depuis le XVIème siècle de nombreux témoignages de leur visite des portes romaines d’Autun. Ce fonds documentaire considérable, constitué de sources écrites et iconographiques, n’avait jusqu’alors pas été étudié de manière globale. Il a fallu mettre en série les sources textuelles afin de comprendre la part des emprunts aux travaux antérieurs. Un travail semblable de critique des représentations iconographiques des portes urbaines a également été effectué. Complément indispensable de l’étude stratigraphique des élévations conservées, l’étude de cette documentation ancienne a permis de proposer une hypothèse de restitution de l’histoire longue des portes d’Augustodunum de leur construction à nos jours. Le dernier volet de ce travail a consisté à replacer les portes d’Autun dans la série des portes urbaines monumentales de l’Occident romain construites entre le IIème siècle av. J.-C. et le IIème siècle ap. J.-C. mais aussi à présenter de nouvelles propositions de restitution du projet architectural, du plan des portes et de l’organisation interne de leurs tours de flanquement. / Augustodunum, civitas Aeduorum, roman city founded under the reign of Augustus, was equipped with four roman city gates : the gate of Arroux and the gate of Saint André, both well preserved, the gate of Saint Andoche which sole remaining part is a flanking tower, and the gate of Rome, destroyed long ago.The heart of this study lies in the stratigraphic reading of those gates structure and in thoughts about the building site of Autun’s city gates operating process. Moreover, since the 16th century, antiquaries, travelers and artists have described in many ways their visits to the roman city gates of Autun. These accounts constitute a major documentary collection of written and iconographical sources that had never been studied as a whole before. A classification of written sources was necessary in order to understand the borrowings from previous works. A similar work of critical study has been realized for the iconographical representations of the gates. As an essential complement of the stratigraphic reading of remaining elevations of the gates, the ancient archeological documentation study was indispensable to propose a restoration hypothesis of Augustodunum’s city gates long term history from their construction time to nowadays. The last section of this study aims to locate Autun’s city gates in the series of monumental city gates built in Western Roman Empire between the 2nd century BC and the 2nd century AD. Furthermore, that section presents new propositions for the restoration of the architectural project, of the gates plan and of the inner organization of these gates flanking towers.