Then Sir Percivale rode forth upon adventures, and came unto Cornwall to seek Sir Tristram. And he delivered him from a prison where King Mark had placed him, and then rode straight unto King Mark and told him he had done himself great shame to treat so falsely Sir Tristram, the knight of most renown in all the world. Then Sir Percivale departed, but anon King Mark bethought him of more treason, notwithstanding his promise never by any manner of means to hurt Sir Tristram, and he let take him and put him again in prison. How he then escaped with Isoud into England we have already read in the tale of Sir Tristram.

Now it chanced that Sir Launcelot of the Lake had sore offended the Queen Guenever, and she rebuked him harshly, called him false traitor knight, and sent him from her court. Therewith he took such an hearty sorrow at her words that he went clean out of his mind, and leaped out at a bay window into a garden, and there with thorns he was all scratched up in his visage. So he ran forth he wist not whither, and for a long while none of his kin wist what was become of him.

Soon Queen Guenever was right sorry that she had been so angry with her faithful knight, and on her knees besought Sir Bors and many others to seek Sir Launcelot throughout all England, Wales, and Scotland. So these noble knights by one assent rode forth by twos and threes; and ever they assigned where they should meet.

Sir Aglovale and Sir Percivale rode together unto their mother that was a queen in those days. And when she saw her two sons, for joy she wept tenderly and said, "Ah my dear sons, when your father was slain he left me five sons, of the which now be three slain; my heart shall never be glad more." Then she kneeled down tofore Aglovale and Percivale, and besought them to abide at home with her.

"Ah, sweet mother," said Sir Percivale, "we may not, for we be come of king's blood on both sides, and therefore, mother, it is our kind to follow arms and noble deeds."

Then there was but weeping and sobbing when they should depart, and after they were gone, she sent a squire after them with spending enough. When the squire had overtaken them, they would not suffer him to ride with them, but sent him home again to comfort their mother, praying her meekly for her blessing.

So this squire was benighted as he rode homeward, and by misfortune happened to come into the castle of a baron whose brother (a false knight and betrayer of ladies and of good knights) Sir Aglovale had slain. When this baron knew from the squire that he served a good knight called Sir Aglovale, he commanded his men to have him away without mercy.

On the morn came Sir Aglovale and Sir Percivale riding by a churchyard where men and women were busy in burying this same dead squire. When the brothers heard from a good man of the company how the baron had shamefully slain the squire that night, they alighted both, left their horses with their men, and went on foot to the castle. All so soon as they were within the castle gate Sir Aglovale bade the porter "Go thou unto thy lord and tell him that I am Sir Aglovale, for whom the squire was slain this night."

Anon the lord of the castle, whose name was Goodewin, came armed into the court, and he and Sir Aglovale lashed together as eagerly as it had been two lions. Sir Percivale fought with all the remnant that would fight, and within a while had slain all that would withstand him, for he dealt so his strokes that there durst no man abide him. Within a while Sir Aglovale had Sir Goodewin also at the earth, and so the two brethren departed and took their horses. Then they let carry the dead squire unto a priory, and there they interred him. When this was done they rode their way into many countries, ever inquiring after Sir Launcelot, but never they could hear of him.

At last, at a castle that was called Cardican, Sir Percivale parted from Sir Aglovale, and with his squire rode alone. In the afternoon he came upon a bridge of stone, where he found a knight that was bound with a chain fast about unto a pillar of stone. This was Sir Persides, a knight of the Table Round, who by adventure came this way and lodged in the castle at the bridge foot. There by an evil custom of the castle men set upon him suddenly or ever he might come to his weapon, and bound him, and chained him at the bridge. There he knew he should die unless some man of honour brake his bands.