The Tales of Arthur
From the paper:
“The female characters in La mort de roi Artu can trace their lineage at least in part to the story of Tristan and Isolde, which tells how the young Tristan traveled to Ireland to ask the hand of the princess Isolde for his uncle, King Mark of Cornwall, but ? due to having mistakenly drunk a love potion ? falls in love himself with Isolde, who also falls in love with him even as the two remain loyal to King Mark.
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Mark attempts to ensnare them, but they remain chaste and true, and Isolde in the end marries Mark.”