Roscommon’s Fallen Fortress
Archived: 25 October 2026
Abstract
In 1277, authority in Ireland was contested through dynastic rivalry, warfare, castles and law. In Thomond, Brian Ruad Ó Briain allied with Thomas de Clare, holder of Edward I’s grant to Thomond, against his nephew Toirrdelbach. Defeated, Brian sought refuge at Bunratty but was seized and executed on de Clare’s orders. In Connacht, Irish forces led by an Ó Conchobair and Domnall Ó Domnaill demolished Roscommon Castle, challenging royal control. Irish people reportedly offered 7,000 marks for English common law, seeking legal protections. The year also recorded ecclesiastical continuity and local raiding, illustrating Ireland’s plural, unstable political order throughout society.