Seán Duffy is a distinguished Professor of Medieval Irish and Insular History at Trinity College Dublin, recognized for his extensive scholarship on medieval Ireland, Anglo-Irish relations, and the Viking Age. A leading historian in the field, Duffy has authored and edited numerous influential works, including Brian Boru and the Battle of Clontarf, which re-examines the iconic High King's legacy and the 1014 battle. He is also the founder and editor of the Royal Irish Academy's Medieval Dublin series, which presents ongoing archaeological and historical research on the city’s early development. His academic contributions have significantly advanced the understanding of Ireland's medieval past within a broader insular context.