This historical study examines the course and consequences of the Black Death in Ireland during the mid-fourteenth century. The author first analyses the international context of the pandemic and the mechanisms through which the plague travelled along commercial maritime networks linking the Mediterranean, England and Ireland. Particular attention is given to the first outbreaks recorded in Irish port towns and to the ways in which the disease spread inland through trade routes and population movements. The book then explores the demographic, economic and social impact of the epidemic on Irish communities. Chronicles, monastic records and administrative documents reveal the sudden collapse of population levels, the abandonment of settlements and the profound disruption of economic life. Religious responses, including penitential practices and interpretations of the plague as divine punishment, are examined alongside contemporary attempts to explain the disease. Finally, the study evaluates the longer-term consequences of the Black Death for medieval Ireland, including changes in landholding patterns, labour relations and the organisation of urban and rural society. Through these analyses the work places the Irish experience within the broader European history of the fourteenth-century plague pandemic.