Niall of the Nine Hostages

…to be the ancestor of Niall of the Nine Hostages (reigned 379–405), who founded the Uí Néill, the greatest dynasty in Irish history.

…dominant; but, by the time Niall of the Nine Hostages died early in the 5th century, hegemony had passed to his midland kingdom of Meath, which was then temporarily associated with Connaught. In the 6th century, descendants of Niall, ruling at Tara in northern Leinster, were claiming to be overkings…