Ambrosius Aurelianus was a 5th century historical figure who defended Britain from Anglo-Saxon invaders. He plays a prominent role in the legends of King Arthur. He's often considered the elder brother of Arthur's father Uther Pendragon, or he's considered the father of the wizard Merlin, or both.
Now Thomas Malory's book Le Morte d'Arthur is widely considered the definitive account of the legend of King Arthur. So my question is, is Ambrosius Aurelianus ever mentioned in Malory's book, and if so what rule does he play? Is he identified as Uther Pendragon's brother, Merlin's father, both, or neither?
And if he's not identified as Merlin's father, who is Merlin's father in Malory's account?