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In page Dál Riata:

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The time in which Dál Riata arose was one of great instability in Ulster, following the Ulaid's loss of territory (including the ancient centre of Emain Macha) to the Airgíalla and the Uí Néill. "The thriving of Dalriada", pp. 47–50, notes a later conquest of Irish Dál Riata from Scotland, in the period after the fall of Emain Macha.[citation needed]