... The King is about the enter Rome, when he has a dream which is later verified, that Modred has seized Wenhaver and the realm as his own.  With the faithful Walwain, Arthur returns, intending to slay Modred and to burn his Queen who has gone over to her "dearest of men."  Walwain wins a landing for the King, but is slain in the fight.  Arthur laments his loss.  Modred is repulsed, and is besieged at Winchester.  He steals away to Cornwall.  Having taken and burned the city, Arthur goes in pursuit of Modred.  Wenhaver takes the veil at Caerleon, and becomes lost to men's knowledge.  The hostile armies engage upon the Tambre.  Modred and all his knights are slain.  Two knights and the King, who is wounded in eleven places, are all that survive on the royal side.  To Constantine, son of Cador, Arthur gives his realm.  He declares that he must go to Avalun, where Argante, the Queen of Elves, shall cure his wounds with healing draughts; afterwards, he shall come to his kingdom, and dwell with joy among the Britons... (A Manual of the Writings in Middle English, Wells, 1917)