Kirsteen M’Urich, The Sea Witch

Fiona MacLeod in Iona tells the story of Black Angus, a huge black seal who cursed Colum "the White" in the fine heathen Gaelic of the Picts and Northmen and mocked the saint’s clerical white garb.

But then, the seal-man did a puzzling thing: he asked Columba for the whereabouts of his wife and daughter. Columba later asked one of his fellow monks about Kirsteen M’Urich, and the monk replies that she was a servant of Christ in the south isles until Black Angus won her to the sea a thousand years ago. She became "the woman that weaves the sea spells at the wild place out yonder that is known as Earraid: she is called the sea-witch; she is Adam’s first wife (Lilith); and Angus’s soul is Judas."