Contested Kingdoms
Archived: 26 September 2026
Abstract
In 1087, Ireland lacked an acknowledged high king after Tairdelbach Ua Briain’s death. His son Muirchertach, king of Munster, defeated a Leinster coalition at Ráith Étair near Dublin, including his exiled brother Diarmait. In Connacht, Ruaidrí Ua Conchobair killed Áed Ua Ruairc at Corann, aided by ecclesiastical authority symbolised by St Ciarán’s staff. Máel Sechlainn of Mide was assassinated, while Domnall Ua Lochlainn extended northern influence and an Ulster-led expedition reached Man. Regional rulers died or were killed. Despite abundant mast, cattle disease, dearth and destructive winds harmed communities. Warfare, urban maritime connections and rural dependence shaped unsettled competitive order.