here followeth a particular account of the enchantment of merlin by a certain damsel, hight vivien, and of all the circumstances thereunto appertaining.

likewise it is to be narrated how king arthur was betrayed by his own sister, and of how he would certainly have been slain only for the help of that same enchantress vivien who was the cause of merlin’s undoing.

also it shall be told how the sheath of excalibur was lost at that time.