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.
    He wed her in Tintagel Minster, but hardly was she wed when the news came to him that his old enemy Duke Morgan had fallen on Lyonesse and was wasting town and field.  Then Rivalen manned his ships in haste, and took Blanchefleur with him to his far land; but she was with child.  He landed below his castle of Kanoël and gave the Queen in ward to his Marshal Rohalt, and after that set off to wage his war.
    Blanchefleur waited for him continually, but he did not come home, till she learnt upon a day that Duke Morgan had killed him in foul ambush.  She did not weep: she made no cry or lamentation, but her limbs failed her and grew weak, and her soul was fillen with a strong desire to be rid of the flesh, and though Rohalt tried to soothe her she would not hear.  Three days she awaited re-union with her lord, and on the fourth she brought forth a son;... (Romance of Tristan and Iseult, Bedier-Belloc, 1907)