Mac Lochlainn of Ulster briefly achieved dominance over Ireland in the 1150s–1160s before Ruaidrí Ua Conchobair (Rory O'Connor) reasserted Connacht power. The contest between these two dynasties shaped the politics that led Diarmait Mac Murchada to seek Norman help — ultimately enabling the Norman invasion.
Muirchertach Mac Lochlainn: c. 2,000–4,000 warriors. Ruaidrí Ua Conchobair: c. 2,000–4,000 warriors.
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