The Morrígan ("terror" or "phantom queen") or Mórrígan ("great queen") (also known as Morrígu, Morríghan, Mor-Ríoghain, sometimes given in the plural as Morrígna) is a figure from Irish mythology who appears to have once been a goddess, although she is not explicitly referred to as such in the texts.
She is associated with sovereignty, prophecy, war, and death on the battlefield. She sometimes appears in the form of a crow, flying above the warriors, and in the Ulster cycle she also takes the form of an eel, a wolf, and a cow. She is generally considered a war deity comparable with the Germanic Valkyries, although her association with cattle also suggests a role connected with fertility, wealth, and the land.
She is often depicted as a triple goddess, although membership of the triad varies; the most common combination is the Badb, Macha and Nemain, but other accounts name Fea, Anann, and others.
There have been attempts by some modern authors of fiction to link the Arthurian character Morgan le Fay with the Morrígan. Morgan first appears in Geoffrey of Monmouth's Vita Merlini (The Life of Merlin) in the 12th century. However, while the creators of the literary character of Morgan may have been somewhat inspired by the much older tales of the goddess, the relationship ends there. Scholars such as Rosalind Clark hold that the names are unrelated, the Welsh "Morgan" (Wales being the source of Arthurian legend) being derived from root words associated with the sea, while the Irish "Morrígan" has its roots either in a word for "terror" or a word for "greatness"
Folklore 
