Ignatius Donnelly
The Colonies of Atlantis
Atlantean trading posts evolved into settlements, spreading into the interior regions and the highlands
Father Seán ÓLaoire
To Gaelic Tír fo Thuinn was an advanced civilization
Father Seán ÓLaoire explains that, according to Gaelic mythology, Atlantis, or Tír fo Thuinn (the Land Under the Waves), was an advanced civilization that sank under the Atlantic Ocean.