The Morrigan is associated with war and fate.
Married to the Dagda, a god known as a king-father, she first appears in a 12th century manuscript by Geoffrey of Monmouth titled The Life of Merlin.
She is a goddess with no blood relation to Arthur, whom she takes to Avalon following his mortal wound in a battle.
Morgana may have taken on some attributes as the Morrigan who first appeared as a Lilith-like creature in a 9th century manuscript containing the Vulgate version of the Book of Isaiah.
The Vulgate version is a late 4th century version of the Bible.
This version became the first publicly recognized version in the Catholic Church and is still used in Roman Catholic Churches.
Morgan le Fay