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Niall Noígíallach, also known as Niall of the Nine Hostages, was an Irish king who became the ancestor of the Uí Néill dynasties that dominated the northern half of Ireland from the 6th to the 10th centuries.
During his younger years, Flann Sinna tried to find Niall's tomb in order to obtain an heirloom shield. While he never succeeded, he mentioned his dream to Eivor Varinsdottir who, after visiting the gravesites of other members of the Uí Néill, found Niall's resting site and claimed the shield.