This thesis aims to determine how and why Rome undertook a series of interventions in Illyria during the period of 230 - 167 BC. The thesis is based on a detailed examination and consideration of the ancient written sources and the subsequent historiography on the subject. The Roman interventions in Illyria during this period have traditionally been treated as a component of wider studies of Roman expansion, although Rome's involvement in Illyria has recently been examined by Dzino in his 2010 work Illyricum in Roman Politics 229BC-AD68. This work examined the development and integration of Illyricum in Roman political discourse, in which the Roman interventions were a smaller component in the broader study. A study of the Roman interventions in Illyria during the period of 230 - 167 BC has never previously been treated on this scale, nor effectively with a synthesis of the various approaches and pieces of evidence that are now available. Over the past decade, marine archaeology has been conducted in the Adriatic and the initial reports have recently been published which provide greater contextual insight on the geopolitical situation in Illyria. Additional new approaches to the subject from the faculty of international relations have emerged, although these have proven as problematic as they have been insightful. This thesis shall examine the new evidence and assess the latest approaches to provide the necessary context for considering the Roman interventions in Illyria. This context shall be initially considered to enable the thesis to progress to consider and analyse each Roman intervention in turn. By effectively grounding the thesis in the geopolitical context, the disparate nature of the communities that made up Illyria can be better understood. This thesis will use the material evidence available in conjunction with the written accounts of ancient historians to consider the implications of the Roman interventions and the underlying motivations for Rome in securing the Adriatic and developing their involvement in Illyria and the Greek East beyond.