Title: The Mists of Avalon
Content:  on the quest for the Holy Grail. ; Cai is Arthur's foster-brother. After a near fatal accident as a small child, Arthur is sent to live with Cai and his father, Ectorius. Cai and Arthur love each other very much, and after Arthur is crowned, he tells Cai, "God strike me if I ever ask that you, brother, should call me [king]." Cai is described as having a facial scar and a limp, two injuries that he received while protecting Arthur during a Saxon invasion. Cai is made Arthur's knight and chamberlain, and he keeps Arthur's castle for him. 
Title: Sir Kay
Content:  Although he manipulates the king to get his way, his loyalty to Arthur is usually unquestioned. In the Vulgate Cycle, the Post-Vulgate and Thomas Malory's Le Morte d'Arthur, Kay's father Ector adopts the infant Arthur after Merlin takes him away from his birth parents, Uther and Igraine. Ector raises the future king and Kay as brothers, but Arthur's parentage is revealed when he draws the Sword in the Stone at a tournament in London. Arthur, serving as squire to the newly knighted Kay, is locked out of the house and cannot get to his brother's sword, so he uses the 
Title: The Virgin in the Ice
Content:  did we suffer during nineteen years because of our sins." The Crusader now herbalist monk in the Benedictine Abbey, Cadfael learns by the return of the Empress's supporters to England that he fathered a son all those years ago. Cadfael learns of him when he first sees him, a grown man in his twenties. Nor can he spend much more than a few hours with him, as this son is squire to a supporter of the Empress in a shire now held by the King and must move to safer ground. He keeps this news to himself, letting his son go without telling him whom he had met.
Title: Brother Cadfael's Penance
Content:  his son, a freighted choice, because he was a father before he was a brother, though he did not know it when he committed to the monastery. Abbot Radulfus, head of the Abbey since 1138 (the end of Monk's Hood), met Olivier in The Pilgrim of Hate, learning in this story that Cadfael is his father. Radulfus sees the sin in Cadfael's earlier time with Mariam, which Cadfael sees otherwise. Radulfus holds the power of forgiveness, to decide the time of penance for this transgression of vows, to say "it is enough". King Stephen and his cousin Empress Maud and their supporters meet under 
Title: Sir Kay
Content:  tales in which a knight is poisoned at Guinevere's feast and the queen is accused of the crime, Karr turns her story into a murder mystery with Kay as the detective attempting to discover the truth. ; In Marion Zimmer Bradley's 1983 The Mists of Avalon, Kay (spelled Cai) is Arthur's foster-brother. After a near fatal accident as a small child, Arthur is sent to live with Cai and his father, Ectorius. Cai and Arthur love each other very much, and after Arthur is crowned, he tells Cai, "God strike me if I ever ask that you, brother, should call 
Title: Sir Kay
Content:  Cai or Cei is one of the earliest characters to be associated with the Arthurian mythology, appearing in a number of early Welsh texts, including Culhwch ac Olwen, Geraint fab Erbin, Iarlles y Ffynnon, Peredur fab Efrawg, Breuddwyd Rhonabwy, Pa Gur, and the Welsh Triads. His father is given as Cynyr Ceinfarfog (Fork-Beard), his son as Garanwyn and his daughter as Kelemon. Before Cai's birth, Cynyr prophesied that his son's heart would be eternally cold, that he would be exceptionally stubborn, and that no one would be able to brave fire or water like him. Cai is attributed with a number of further superhuman abilities, including the ability to go nine days and nine nights without the need to breathe 
Title: Cadfael (TV series)
Content:  and its identity, not the murder of a faraway knight, becomes the subject of the mystery. Matthew and Ciaran are brothers, pointing fingers as to who is responsible for their father's death. In this adaptation Matthew is the villain. Crippled Rhun, far from being one of Cadfael's most promising future novices, confirms Father Abbot's suspicions that he fakes his condition to earn the charity of those around him; his sister Melangell has been forced by guilt to wait on him hand and foot, even stealing to support their needs. It was the last of Ellis Peters' novels to be adapted for the screen. 
Title: Brother Cadfael's Penance
Content:  Shrewsbury Abbey. Allows Cadfael to leave the cloister, on his own, breaking his vow of stability. Radulfus met Olivier in The Pilgrim of Hate four years earlier, but only now learns he is Cadfael's son. Based on real Abbot of that year. ; Olivier de Bretagne: Young knight in the service of Laurence d’Angers on the side of the Empress, husband of Ermina, who is sister to Yves Hugonin; son of Cadfael and Mariam, half Welsh and half Syrian. He left Antioch when his mother died, when he was 14, knowing his father only from her stories of him, and choosing his father's faith. He is 30 
Title: The Fort at River's Bend
Content:  tactics and problem solving, and has a strong sense of justice. ; Caius Merlyn Brittanicus - The narrator of the story and former commander of the Camulodian military. At the beginning of the book he takes a vow of chastity and believes he has leprosy, however these both change later. He has named himself the guardian and teacher of Arthur, wishing to ensure that Arthur will be able to claim the throne of Pendragon. He has chosen to go by the name Cay throughout the book in order to escape his reputation as Merlyn. He is exceptionally schooled in Roman 
Title: Caw of Strathclyde
Content: Hywel ; Ane ; Aneurin ; Saint Caffo ; Ceidio ; Aeddan Foeddog ; Cwyllog ; Dirynig ; Saint Cain ; Saint Eigrad ; Samson of York ; Saint Eigron ; Gwenafwy ; Gallo ; Saint Peirio ; Cewydd ; Maelog ; Meilig ; Gwrddelw ; Gwrhai ; Huail mab caw He was the father to many children, many of whom were saints. The most well known was Gildas, which possibly accounts for the poor presentation of King Arthur (and also Constantine) in Gildas' writing. His children are reputed to include:

Question: Who is the father of Caveat?
Answer: Cannonade.