And that it is not an exclusive realm is certain from what our old Irish manuscripts record concerning the fomorian races.
"The Fairy-Faith in Celtic Countries"
W. Y. Evans Wentz
Then Iubdan went forth to meet Eisirt, and he kissed him, and said, "Why hast thou brought this fomorian with thee to slay us?"
"The High Deeds of Finn and other Bardic Romances of Ancient Ireland"
T. W. Rolleston
Cuchulainn's reckoning of the men of Ireland on the Tain; and ug's reckoning of the fomorian hosts at the battle of Mag Tured; and Ingcel's reckoning of the hosts at the Bruiden Da Derga.
"The Cattle-Raid of Cualnge (Tain Bo Cualnge)"
Unknown