In Malory, Aries was a cowherd, reputed father of Sir Tor, and actual father of twelve sons besides.
At the time of Arthur’s marriage, Aries reluctantly yielded to Tor’s desire and brought him to Arthur’s court at London to request knighthood for the boy. After comparing Tor with his twelve supposed younger brothers and finding him unlike any of them, Arthur dubbed the boy. Merlin then explained that King Pellinore had begotten Tor on the housewife Vayshoure when he took her maidenhead.
Being assured both by Merlin and by the woman that Tor had been begotten before ever she was wedded, Aries remarked,
[I]t is the less grief unto me.
In French romance, he is called Ars, a king and the real father of Tor.
Le Morte Darthur | Sir Thomas Malory, 1469-1470