Major sources of the legend include Chrétien's Li Contes del Graal; Perceval, ou Le Conte du Graal (c. 1160–1180), Wauchier de Denain's First Continuation (c. 1180–1200), Robert de Boron's Didot-Perceval (c. 1191–1202), Peredur son of Efrawg (c. 1200), Perlesvaus (c. 1200), Wolfram von Eschenbach's Parzival (c. 1217), and Thomas Malory's Morte D'Arthur (c. 1400).
The Fisher King first appears in Chrétien de Troyes's Perceval, the Story of the Grail in the late 12th century, but the character's roots may lie in Celtic mythology.
The group lands on the island of Gwales, where they spend 80 years in a castle of joy and abundance, but eventually they leave and bury Bran's head in London.
This story has analogues in two other important Welsh texts: the Mabinogion tale "Culhwch and Olwen", in which King Arthur's men must travel to Ireland to retrieve a magical cauldron, and the poem The Spoils of Annwn, which speaks of a similar mystical cauldron sought by Arthur in the otherworldly land of Annwn.
The Welsh Romance Peredur son of Efrawg is based on Chrétien or derived from a common original, but it contains several prominent deviations and lacks a Grail.
The Fisher King's next development occurred around the end of the 12th century in Robert de Boron's Joseph d'Arimathie [fr], the first work to connect the Grail with Jesus.
Here, the "Rich Fisher" is called Bron, a name similar enough to Bran to suggest a relationship, and said to be the brother-in-law of Joseph of Arimathea, who had used the Grail to catch Christ's blood before laying him in the sepulchre.
Galahad is raised by his aunt in a convent, and when he is eighteen, comes to King Arthur's court and begins the Grail Quest.
The nature of Pellam's sin is not stated explicitly, though he at least tolerates his murderous brother Garlon, who slays knights while under cover of invisibility, apparently at random.
It appears that Malory intended to have one Maimed King who was wounded by Balin and suffered until healed by his grandson Galahad, but he never successfully reconciled his sources.
Such a wound was considered worse than actual death because it signaled the end of a man's ability to function in his primary purpose: to propagate his line.
The two pieces that hold particularly stronger Christian themed deviations than prior works are the Queste del Saint Graal and the Sone de Nausay.
The Grail maidens become angels, there is a constant relationship between the knights and religious symbolism; most importantly, the Fisher King is replicated as a priest-like figure.
[8] In the case of Sone de Nausay, Bron (the Fisher King) is part of a tale in which the story makes a constant correlation between the Gospel narrative and the history of the Grail.
[10] Chrétien describes his lance with "marvelous destructive powers", which holds a closer connection to the malignant weapons of Celtic origin.
This lance is plunged into the Fisher King's wound at different times to continue his pain, as punishment for having sought forbidden love.
[10] This lance is considered significant because it is most often associated directly with the wound of the Fisher King, which is demonstrated both in Chrétien's and Eschenbach's versions of the tale.
In two cases, the writers tell us that Perceval broke the sword: in Eschenbach, it fails him in his battle against his half-brother at the end of Parzival; and Gerbert de Montreuil describes how he shatters it on the gates of the "Earthly Paradise".
This concept of punishment is also seen in Eschenbach's tale where Perceval is told: "your uncle gave you a sword, too, by which you have been granted since your eloquent mouth unfortunately voiced no question there.