Roscommon’s Counter-Castle
Archived: 21 October 2026
Abstract
During 1418, Ireland’s fragmented landscape was shaped by dynastic deaths, raids, fortification and scholarship. In Breifne, the deaths of Tigernán Mór Ó Ruairc, his heir Eógan, and East Breifne’s Risderd Ó Raigillig triggered contested successions; Risderd and his household drowned in Lough Sheelin. At Roscommon, Uilliam Ó Cellaig built a castle opposite the stronghold, resisting an Ó Conchobair-led siege. A royal council met at Naas, while Furnival’s raids in Iveagh met resistance and northern conflict involved Ó Domnaill and Ó Néill. Connacht saw cattle raids and violence. Meanwhile, the Great Book of Lecan neared completion, demonstrating scholarly patronage amid warfare.