Lancelot has a son called Galahad with a woman named Elaine of Corbenic. The father of Elaine of Corbenic is the Fisher King, sometimes called King Pelles, the guardian of the Holy Grail. Legend has it that he is descended from Bron who was a follower of Joseph of Arimathea, who brought the Grail to Britain. He is also thought to be derived in part from the character of Bran the Blessed in the Welsh Mabinogian. Bran possessed a magic cauldron that could resurrect the dead. This brings to mind the North, with the connection between the cauldron and the resurrected dead of the Land of Always Winter, the name Bran, and Welsh mythology in general. Given that, I would assume a Stark connection to the characters of Elaine and Pelles.
Malory describes Elaine as “passing fair and young.” Compare that to Eddard Stark’s memory of his sister “Lyanna had only been sixteen, a child woman of surpassing loveliness.” (AGoT, ch.4) After Lancelot rescues Elaine from a “scalding bath” she falls in love with him. Applying this to Lyanna, could she have been in trouble with a Targaryen? Did Aerys actually discover the truth behind tKotLT only to have someone save her from punishment at the tournament? Was Rhaegar’s crowning her QoLaB a symbolic message to his father that she was under his protection? In the story of Elaine of Corbenic and Lancelot, Elaine must ultimately resort to a magical disguise to trick him into lying with her and conceiving Galahad. I propose that, with typical Martinism, the analogy is now given a different twist.
Lancelot is closely connected with a traditional folk story that has three main elements: a child raised by a water sidhe, the reappearance of the (now grown) hero at a tournament on three consecutive days in three different disguises, and the rescue of a kidnapped queen.
If we assume the Lyanna Stark is tKotLT and also analogous to Elaine of Corbenic, we see that she is associated with disguises. The disguise Elaine assumes is of Gwenhwyfar. If we assign the role of sidhe child to the crannogman and agree that Lyanna’s disguise as tKotLT and defeat of three champions satisfies the second element we have two of the elements of the original topos present. This may be a hint that Lyanna is now moving into the third element or the role of Gwenhwyfar, the captive queen.
*A note on the etymology of Corbenic, which I believe ties Corbenic, Elaine and the Fisher King very closely to the Starks. There are a number of possible linguistic connections, among them the Brythonic Caer Bran (literally Fort of Bran, or Fort of the Raven) and the middle French corbin, also meaning Raven, thought by many to be an allusion to Bran the Blessed with whom the Fisher King is closely connected.