From A Compendium of Irish Biography, 1878
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De Cogan, Richard, younger brother of preceding, specially distinguished himself in the defence, above mentioned, of Dublin. He is spoken of as having been appointed to the command of a picked body of troops by King Henry II. and sent into Ireland to supply the place of his brother Milo.
Sources
148. Giraldus Cambrensis: Topography, and History of the Conquest in Ireland: Forester and Wright. London, 1863.