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King of Leinster
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Dermot established his authority by killing or blinding 17 rebel chieftains of northern Leinster.
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In 1166 Dermot was driven from Ireland.
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Some information on what happened after the Normans arrived Returning to Leinster in 1167 with an advance party of Anglo-Normans, Dermot established a foothold there.
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Pembroke arrived in August 1170, and Dermot then helped the invaders capture Dublin
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