BOOK XXI CHAPTER I How Sir Mordred presumed and took on him to be King of England, and would have married the queen, his father's wife BOOK XXI CHAPTER II How after that King Arthur had tidings, he returned and came to Dover, where Sir Mordred met him to let his landing; and of the death of Sir Gawaine BOOK XXI CHAPTER III How after, Sir Gawaine's ghost appeared to King Arthur, and warned him that he should not fight that day BOOK XXI CHAPTER IV How by misadventure of an adder the battle began, where Mordred was slain, and Arthur hurt to the death BOOK XXI CHAPTER V How King Arthur commanded to cast his sword Excalibur into the water, and how he was delivered to ladies in a barge BOOK XXI CHAPTER VI How Sir Bedivere found him on the morrow dead in an hermitage, and how he abode there with the hermit BOOK XXI CHAPTER VII Of the opinion of some men of the death of King Arthur; and how Queen Guenever made her a nun in Almesbury BOOK XXI CHAPTER VIII How when Sir Lancelot heard of the death of King Arthur, and of Sir Gawaine, and other matters, he came into England BOOK XXI CHAPTER IX How Sir Launcelot departed to seek the Queen Guenever, and how he found her at Almesbury BOOK XXI CHAPTER X How Sir Launcelot came to the hermitage where the Archbishop of Canterbury was, and how he took the habit on him BOOK XXI CHAPTER XI How Sir Launcelot went with his seven fellows to Almesbury, and found there Queen Guenever dead, whom they brought to Glastonbury BOOK XXI CHAPTER XII How Sir Launcelot began to sicken, and after died, whose body was borne to Joyous Gard for to be buried BOOK XXI CHAPTER XIII How Sir Ector found Sir Launcelot his brother dead, and how Constantine reigned next after Arthur; and of the end of this book