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Túathal Techtmar (; 'the legitimate'), son of Fíachu Finnolach, was a High King of Ireland, according to medieval Irish legend and historical tradition. He is said to be the ancestor of the Uí Néill and Connachta dynasties through his grandson Conn of the Hundred Battles. The name may also have originally referred to an eponymous deity, possibly even a local version of the GaulishToutatis.