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Average elevation: 48 m

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As the word Castle did not come into use in Ireland until Norman times we know that Castleknock is a name of comparatively recent origin. Documents from the 12th and 13th centuries refer to the place as Castrum Cnoc, simply Cnoc and also Chastel-cnoc or Castel-Cnoc. So it seems that the name Castleknock is…

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