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Ancient Irish people
The Erdini (Έρδινοι) or Erpeditani (Έρπεδιτανοι) 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.
References
T. F. O'Rahilly, Early Irish History and Mythology, Dublin Institute for Advanced Studies, 1946, p. 2
