Toirdelbach mac Murchada meic Briain (c. 999 – 23 April 1014) was the grandson of Brian Boru and one of the leaders of the Dál gCais-led Irish army at the Battle of Clontarf, where he was killed (likely by drowning) while leading Irish forces pursuing the fleeing Vikings.

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Toirdelbach was the son of Murchad mac Briain, the putative heir of Brian, who was also killed at Clontarf.

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