Lilith

Rabbinical scripture says she was the first wife of Adam, but refused to be submissive to him and became a demoness of some sort who set up shop on the coast of the Red Sea. Is reputed to be responsible for many of the world's demons and monsters, especially the succubi. According to a Muslim legend, she slept with Satan and produced all the Djinn too.

She used to be imprisoned in the One-Year Dungeon until Harald foolishly set her free. Gave birth to Lady Thora, who claims Thorbjorn is her father, even though Harald has insisted in the past that he slept with Lilith, and is therefore the father.

From the Zohar

    The principles of which these letters are the symbols ultimated in their manifestation on
    the phenomenal plane of existence and the production of a blended and harmonious whole,
    viz., of man in the form of male and female until the Lord God caused a deep sleep to fall
    upon him (Gen. ii. 21). The Holy One then separated them and having clothed the latter in
    a form most fair and beautiful brought her to man, as a bride is adorned and led to the
    bridegroom. Scripture states that He took one of the sides or parts (of the androgynous
    form) and filled up the place with flesh in its stead. In a very ancient occult book we
    have found it stated that what God took from the side of Adam was not a rib but Lilith,
    who had cohabited with him and given birth to offspring. She was however an unsuitable
    helpmeet for Adam and therefore Scripture states, 'But for Adam there was not found a
    helpmeet for him' (Gen. ii. 20). After the disappearance of Lilith and Adam's descent into
    the world plane of existence, then it was, as stated, 'The Lord God said, It is not good
    that man should be alone, I will make him a helpmeet for him.'"

From the Alphabet of Ben Sira

    Soon afterward the young son of the king took ill. Said Nebuchadnezzar, "Heal my son. If
    you don't, I will kill you." Ben Sira immediately sat down and wrote an amulet with the
    Holy Name, and he inscribed on it the angels in charge of medicine by their names, forms
    and images, and by their wings, hands, and feet. Nebuchadnezzar looked at the amulet. "Who
    are these?" 
    
    "The angels who are in charge of medicine: Snvi, Snsvi, and Smnglof. After God created
    Adam, who was alone, He said, 'It is not good for man to be alone' (Gen. 2:18). He then
    created a woman for Adam, from the earth, as He had created Adam himself, and called her
    Lilith. Adam and Lilith began to fight. She said, 'I will not lie below,' and he said, 'I
    will not lie beneath you, but only on top. For you are fit only to be in the bottom
    position, while I am to be in the superior one.' Lilith responded, 'We are equal to each
    other inasmuch as we were both created from the earth.' But they would not listen to one
    another. When Lilith saw this, she pronounced the Ineffable Name and flew away into the
    air. Adam stood in prayer before his Creator: 'Sovereign of the universe!' he said, 'the
    woman you gave me has run away.' At once, the Holy One, blessed be He, sent these three
    angels to bring her back. 
    
    "Said the Holy One to Adam, 'If she agrees to come back, fine. If not she must permit one
    hundred of her children to die every day.' The angels left God and pursued Lilith, whom
    they overtook in the midst of the sea, in the mighty waters wherein the Egyptians were
    destined to drown. They told her God's word, but she did not wish to return. The angels
    said, 'We shall drown you in the sea.' 
    
    "'Leave me!' she said. 'I was created only to cause sickness to infants. If the infant is
    male, I have dominion over him for eight days after his birth, and if female, for twenty
    days.' 
    
    "When the angels heard Lilith's words, they insisted she go back. But she swore to them by
    the name of the living and eternal God: 'Whenever I see you or your names or your forms in
    an amulet, I will have no power over that infant.' She also agreed to have one hundred of
    her children die every day. Accordingly, every day one hundred demons perish, and for the
    same reason, we write the angels' names on the amulets of young children. When Lilith sees
    their names, she remembers her oath, and the child recovers."