In Malory IX, Sir Tor is called “le Fise de Vayshoure” – the son of Vayshoure.
When Aries the cowherd brought his supposed son Tor to Arthur, the King asked to see Aries’ wife.
Anon the wife was fetched, which was a fair housewife, and there she answered Merlin full womanly, and there she told the king and Merlin that when she was a maid, and went to milk kine, there met with her a stern knight [Pellinore], and half by force he had my maidenhead, and at that time he begat my son Tor, and he took away from me my greyhound that I had that time with me, and said that he would keep the greyhound for my love. Ah, said the cowherd, I weened not his, but I may believe it well, for he [Tor] had never no tatches of me. Sir, said Tor unto Merlin, dishonour not my mother. Sir, said Merlin, it is more for your worship than hurt, for your father is a good man and a king, and he may right well advance you and your mother, for ye were begotten or ever she was wedded. That is truth, said the wife. It is the less grief unto me, said the cowherd.
See also
Merlin | The Legend of King Arthur
Pellinore of the Isles | The Legend of King Arthur