The Tuatha Dé Danann had travelled to the “Northern Isles” where they learned many skills and magic in its four cities Falias, Gorias, Murias and Findias. From there they travelled to Ireland bringing with them a treasure from each city – the four legendary treasures of Ireland. From Falias came the Lia Fáil. The other three treasures are the Claíomh Solais or Sword of Light, the Sleá Bua or Spear of Lugh and the Coire Dagdae or The Dagda’s Cauldron.
Source: Lia Fáil – Wikipedia
Tim B.
https://en.wikipedia.org/wiki/Four_Treasures_of_the_Tuatha_D%C3%A9_Danann
“The first recension of Lebor Gabála describes the Tuatha Dé Danann as having resided in “the northern islands of the world”, where they were instructed in the magic arts, before finally moving in dark clouds to Connaught in Ireland.”