The Erdini (Έρδινοι) or Erpeditani (Έρπεδιτανοι)T. F. O'Rahilly, Early Irish History and Mythology, Dublin Institute for Advanced Studies, 1946, p. 2 were a people referred to in Ptolemy's 2nd century Geography as living in the north-west of Ireland, in the area of Donegal Bay.Ptolemy, Geography 2.1Philip Freeman, Ireland and the Classical World, University of Texas Press, 2001, p. 75
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