The king named some half-dozen of his knights, Sir Ivaine among them, who were to undertake this adventure. Sir Ivaine was displeased; he thought that the adventure should be his alone. So he rose in the middle of the night and stole away unattended, determined to go in advance of the others and kill the Black Knight. It did not occur to him that in proving himself brave, he was also proving himself disobedient. He rode forth in the darkness, humming merrily to himself. At daybreak he reached a valley, and as he went through it, saw a great serpent fighting with a lion. Sir Ivaine stopped to watch this curious combat. At first the two fighters seemed evenly matched, but soon the huge serpent wrapped all its folds about the lion and began squeezing it to death. When Sir Ivaine saw this, he drew his sword and killed the serpent. When the lion was free, it bounded up to Sir Ivaine, and he was afraid that it meant to kill him; but it fawned at his feet like a spaniel. He stroked it, and put his arms about its neck. When he mounted his horse, the beast followed him, refusing to go away. Then Sir Ivaine made up his mind that they were to be companions. For many days the two kept close together, and at night Sir Ivaine would go to sleep with his head on the lion's neck. One day, as they came to a square castle set in a meadow, some people who stood on the castle walls began to shoot arrows at the lion, but Sir Ivaine stopped them, telling them that the animal was tame. Then they told him that it was their rule that no one should pass by that castle without doing battle with their lord. Sir Ivaine told them that he was quite willing to obey their rule; so they opened the castle gate. They said he must make his lion stay outside, but Sir Ivaine refused to do this. He promised, however, to make the lion lie down quietly; then the two were allowed to enter. The courtyard was a large paved place, in which there were a score of armed men. Presently the lord of the castle came forward. This lord was much larger than Sir Ivaine, and the lion, on seeing him, began to lash its tail. But Sir Ivaine ordered it to be still, and it at once obeyed. Then Sir Ivaine and the knight battled together. The knight was powerful, but Sir Ivaine was very agile and skillful. He was not able to strike so hard as could his enemy, but he was better able to avoid blows. Therefore it was not long before he got the advantage and overthrew the lord.