Tory Island is famous as having been the mythical stronghold of the Fomorians, led by Balor. Balor was said to have stolen the magic cow, Glas Gaibhlinn, from Gabhan the smith on the mainland. He brought it to Poirtín Ghlais, dragging her up the beach by her tail. There's a little explanation about why, even though she's described as a milch white cow, the Glas Gaibhlinn's name, glas, means green or grey.
|Tory Island ... "it is sometimes opalescent, sometimes shadowed in sapphire and golden brown".|