Then was Sir Tristram missed, and no creature wist where he was become. When La Beale Isoud heard how he was missed, privily she went unto Sir Sadok, and prayed him to espy where was Sir Tristram. Then when Sadok wist how Sir Tristram was missed, and anon espied that he was put in prison by King Mark and the traitors of Magouns, then Sadok and two of his cousins laid them in an ambushment, fast by the Castle of Tintagil, in arms. And as by fortune, there came riding King Mark and four of his nephews, and a certain of the traitors of Magouns. When Sir Sadok espied them he brake out of the bushment, and set there upon them. And when King Mark espied Sir Sadok he fled as fast as he might, and there Sir Sadok slew all the four nephews unto King Mark. But these traitors of Magouns slew one of Sadok’s cousins with a great wound in the neck, but Sadok smote the other to the death. Then Sir Sadok rode upon his way unto a castle that was called Liones, and there he espied of the treason and felony of King Mark. So they of that castle rode with Sir Sadok till that they came to a castle that hight Arbray, and there in the town they found Sir Dinas the Seneschal, that was a good knight. But when Sir Sadok had told Sir Dinas of all the treason of King Mark he defied such a king, and said he would give up his lands that he held of him. And when he said these words all manner knights said as Sir Dinas said. Then by his advice and of Sir Sadok’s, he let stuff all the towns and castles within the country of Liones, and assembled all the people that they might make. CHAPTER LI. How King Mark let do counterfeit letters from the Pope, and how Sir Percivale delivered Sir Tristram out of prison. Now turn we unto King Mark, that when he was escaped from Sir Sadok he rode unto the Castle of Tintagil, and there he made great cry and noise, and cried unto harness all that might bear arms. Then they sought and found where were dead four cousins of King Mark’s, and the traitor of Magouns. Then the king let inter them in a chapel. Then the king let cry in all the country that held of him, to go unto arms, for he understood to the war he must needs. When King Mark heard and understood how Sir Sadok and Sir Dinas were arisen in the country of Liones he remembered of wiles and treason. Lo thus he did: he let make and counterfeit letters from the Pope, and did make a strange clerk to bear them unto King Mark; the which letters specified that King Mark should make him ready, upon pain of cursing, with his host to come to the Pope, to help to go to Jerusalem, for to make war upon the Saracens.