After this adventure Sir Tristram abode still at his uncle's court, till in the envy of his heart King Mark devised a plan to be rid of him. So on a certain day he desired him to depart again for Ireland, and there demand La Belle Isault on his behalf, to be his queen--forever had Sir Tristram praised her beauty and her goodness, till King Mark desired to wed her for himself. Moreover, he believed his nephew surely would be slain by the queen's kindred if he once were found again in Ireland. But Sir Tristram, scorning fear, made ready to depart, and took with him the noblest knights that could be found, arrayed in the richest fashion. And when they were come to Ireland, upon a certain day Sir Tristram gave his uncle's message, and King Anguish consented thereto. But when La Belle Isault was told the tidings she was very sorrowful and loth--yet made she ready to set forth with Sir Tristram, and took with her Dame Bragwaine, her chief gentlewoman. Then the queen gave Dame Bragwaine, and Governale, Sir Tristram's servant, a little flask, and charged them that La Belle Isault and King Mark should both drink of it on their marriage day, and then should they surely love each other all their lives. Anon, Sir Tristram and Isault, with a great company, took the sea and departed. And so it chanced that one day sitting in their cabin they were athirst, and saw a little flask of gold which seemed to hold good wine. So Sir Tristram took it up, and said, "Fair lady, this looketh to be the best of wines, and your maid, Dame Bragwaine, and my servant, Governale, have kept it for themselves." Thereat they both laughed merrily, and drank each after other from the flask, and never before had they tasted any wine which seemed so good and sweet. But by the time they had finished drinking they loved each other so well that their love nevermore might leave them for weal or woe. And thus it came to pass that though Sir Tristram might never wed La Belle Isault, he did the mightiest deeds of arms for her sake only all his life. Then they sailed onwards till they came to a castle called Pluere, where they would have rested. But anon there ran forth a great company and took them prisoners. And when they were in prison, Sir Tristram asked a knight and lady whom they found therein wherefore they were so shamefully dealt with; "for," said he, "it was never the custom of any place of honor that I ever came unto to seize a knight and lady asking shelter and thrust them into prison, and a full evil and discourteous custom is it." "Sir," said the knight, "know ye not that this is called the Castle Pluere, or the weeping castle, and that it is an ancient custom here that whatsoever knight abideth in it must needs fight the lord of it, Sir Brewnor, and he that is the weakest shall lose his head. And if the lady he hath with him be less fair than the lord's wife, she shall lose her head; but if she be fairer, then must the lady of the castle lose her head."