The Dream of Aengus

"Caer lived under a strange enchantment. Her father was King Ethal of the Shee-mound at Navan, a sorcerer so powerful that only the Dagda was his equal. Because of King Ethal's fear that Caer would one day marry a mortal man, he laid a curse upon her. This was her fate--to live every other year in the form of a swan on the cold, empty waters of Loch Bel Dracon".