Mangerton’s Costly Victory
Archived: 25 October 2026
Abstract
In 1262, Ireland experienced interconnected conflicts and negotiations across Connacht, Annaly, Munster and church politics. Fedlimid Ó Conchobair and his son Áed resisted forces led by Mac William de Burgh, the justiciar and John de Verdun, safeguarding cattle, devastating enemy territory and making a temporary peace. Roscommon was selected for a future royal castle. In Annaly, Gilla na Naem Ó Fergail regained lordship after local defections. Mac Carthaig defeated an expedition at Mangerton, but Cormac Mac Carthaig died. Munster endured further raids. At Drogheda, Archbishop Máel Pátraic Ó Scannail reinforced Armagh’s jurisdiction over Meath, while Dublin disputes exposed urban tensions.