Tlachtga is one of very few quadrivallate ringforts in Ireland and a site that has long been regarded as of potential 'Royal' status. It is a site with significant associated folklore and historical narrative associated with it. In the 12th century, Tlachtga was the scene of negotiations between Hugh de Lacy and Tighernan Ui Ruairc, king of Breiffne, at which Ui Ruairc was said to have been slain by treachery and his head sent to Henry II in London.
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