The Romance of Tristan and Iseult by Joseph Bédier

My lords, if you would hear a high tale of love and of death, here is that of Tristan and Queen Iseult; how to their full joy, but to their sorrow also, they loved each other, and how at last they died of that love together upon one day; she by him and he by her.
Long ago, when Mark was King over Cornwall, Rivalen, King of Lyonesse, heard that Mark’s enemies waged war on him; so he crossed the sea to bring him aid; and so faithfully did he serve him with counsel and sword that Mark gave him his sister Blanchefleur, whom King Rivalen loved most marvellously.’ -an excerpt
A romantic folktale from medieval France that dates back to 12th century.