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The Ériuians are a people on the alternate medieval Earth. Sefawynn says that Friag's binding of Fenris saved the Ériuians, along with the rest of the world's peoples, though they were not aware of the battle[1].
Trivia
The Ériuians are presumably this alternate dimension's version of the Irish. In the real world, Ériu is the Old Irish name for Ireland.
References