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Only one bit of the stone outworks remains, the rest having been carted off long ago. You can still see some voids in the swampy ground where those additional walls and towers would have sat.

The owners, the O'Connor-Kerry's, built the castle around 1490 and used it and a fleet of ships to exert a tribute (often paid in the form of wine) on merchant ships passing up the Shannon to Limerick and other places.