-- Sieur Guillaume de Roussillon slays his wife's paramour, Sieur Guillaume de Cabestaing, and gives her his heart to eat. She, coming to wit thereof, throws herself from a high window to the ground, and dies, and is buried with her lover. -- Neifile's story, which had not failed to move her gossips to no little pity, being ended, none now remained to speak but the king and Dioneo, whose privilege the king was minded not to infringe: wherefore he thus began:--I propose, compassionate my ladies, to tell you a story, which, seeing that you so commiserate ill-starred loves, may claim no less a share of your pity than the last, inasmuch as they were greater folk of whom I shall speak, and that which befell them was more direful. You are to know, then, that, as the Provencals relate, there were once in Provence two noble knights, each having castles and vassals under him, the one yclept Sieur Guillaume de Roussillon, and the other Sieur Guillaume de Cabestaing;(1) and being both most doughty warriors, they were as brothers, and went ever together, and bearing the same device, to tournament or joust, or other passage of arms. And, albeit each dwelt in his own castle, and the castles were ten good miles apart, it nevertheless came to pass that, Sieur Guillaume de Roussillon having a most lovely lady, and amorous withal, to wife, Sieur Guillaume de Cabestaing, for all they were such friends and comrades, became inordinately enamoured of the lady, who, by this, that, and the other sign that he gave, discovered his passion, and knowing him for a most complete knight, was flattered, and returned it, insomuch that she yearned and burned for him above all else in the world, and waited only till he should make his suit to her, as before long he did; and so they met from time to time, and great was their love. Which intercourse they ordered with so little discretion that 'twas discovered by the husband, who was very wroth, insomuch that the great love which he bore to Cabestaing was changed into mortal enmity; and, dissembling it better than the lovers their love, he made his mind up to kill Cabestaing. Now it came to pass that, while Roussillon was in this frame, a great tourney was proclaimed in France, whereof Roussillon forthwith sent word to Cabestaing, and bade him to his castle, so he were minded to come, that there they might discuss whether (or no) to go to the tourney, and how. Cabestaing was overjoyed, and made answer that he would come to sup with him next day without fail. Which message being delivered, Roussillon wist that the time was come to slay Cabestaing. So next day he armed himself, and, attended by a few servants, took horse, and about a mile from his castle lay in ambush in a wood through which Cabestaing must needs pass. He waited some time, and then he saw Cabestaing approach unarmed with two servants behind, also unarmed, for he was without thought of peril on Roussillon's part. So Cabestaing came on to the place of