It is Lios Tuathail which means Tuathal's ringfort.
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it's simply (tu-thal) where the tu is pronounced as (too)
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Ireland's highest mountain is Carrauntoohil, translated from the
Irish Corrán Tuathail meaning "Tuathal's sickle", with an
elevation of 1038 metres, or 3406 feet.
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The last high king was Brian Boru Mael Sechnaill (II) mac Domnaill was the last true High King of Ireland. After his death the position was held in opposition until the Norman Conquest