This book tackles the difficult challenge of uncovering the pathogenic cause, epidemiological mechanics and broader historical impacts of an extremely deadly third-century ancient Roman pandemic. The core of this research is embodied in a novel systems synthesis methodology that allows for ground-breaking historical-scientific problem-solving. Through precise historical and scientific problem-solving, analysis and modelling, the authors piece together a holistic puzzle portrait of an ancient plague that is fully consistent, in turn, with both the surviving ancient evidence and the latest in cutting edge twenty-first-century modern medical and molecular phylogenetic science. Demonstrating the broader relevance of the crisis-beset world of the third-century Roman Empire in providing guiding and cautionary historical lessons for the present, this innovative book provides fascinating insights for students and scholars across a range of disciplines.