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In page Manannán mac Lir:

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An over-king's role for Manannán among the Tuatha Dé Danann is described in the narrative Altram Tige Dá Medar ("The Nourishment of the Houses of Two Milk-Vessels") in the 14th to the 15th century century manuscript, the Book of Fermoy.[1][2] Máire MacNeill gave a summary of the work.[3][a]