The logical conclusion appears to be that the Charrette poem is a "Tendenz-Schrift," composed under certain special conditions, in response to a special demand.
Lancelot, already popular hero of a tale in which an adventure parallel to that of the Charrette figured prominently, was pressed into the service, Modred, Guenevere's earlier lover, being too unsympathetic a character; moreover, Modred was required for the final role of traitor.
Here we must distinguish between the Lancelot proper and the LancelotGuenevere versions; so far as the latter are concerned, we cannot get behind the version of Chretien, - nowhere, prior to the composition of the Chevalier de la Charrette is there any evidence of the existence of such a story.
Malory's version of the Charrette adventure differs in many respects from any other extant form, and the source of this special section of his work is still a question of debate among scholars.
The LancelotGuenevere romance took form and shape in the artificial atmosphere encouraged by such patronesses of literature as Eleanor of Aquitaine and her daughter Marie, Comtesse de Champagne (for whom Chretien de Troyes wrote his Chevalier de la Charrette), and reflects the low social morality of a time when love between husband and wife was declared impossible.