"Caer Ibormeith" Celtic goddess of sleep and dreams
The celtic goddess of sleep and dreams.
In swan form for a year at a time she would vist her lover in his dreams every night only to disappear. One day every alternate Samhain she would transform to a human maiden , only to return to swan form for the following year. Her lover Oengus was told if he could pick which swan was his lover he could marrie her. When he chose correctly he was turned in to a swan him self. And together they flew away.