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The Morrigan is a phantom queen from Irish mythology who was/is considered the Celtic goddess of battle, strife and fertility. She is a shape-shifter that takes the form of a crow, wolf, horse or cow. She is said to have presided over rivers, lakes and fresh water.
The Morrigan (or Morrigu) is associated with revenge, the night, magic and prophecy. In many of the stories she appears as a trio of goddesses taking the image of maiden, mother and crone.
The Celts believed that when a battle began, the Morrigan flew above them in the form of a raven or crow, shrieking at the possibility of claiming fallen soldiers.
You can read more about her here: http://www.mythicalireland.com/mythology/tuathade/morrigan.html