Soon after the tournament, Lamerok goes to the lady he has loved and served, Lot's widow, Gawain's mother. Gaheris comes into the bedroom, kills his mother, and says he will kill Lamerok if they meet when Lamerok is armed. Gawain's brothers Mordred and Aggravain fight Dynadin because of his friendship with Lamerok.
Meanwhile King Mark, safe in Cornwall, writes a scornful letter to Arthur and another to Guinevere accusing her of faithlessness. Mark's enemies invade his land and, little as he likes it, he is forced to ask Tristram's help. Tristram deploys Mark's forces, fights nobly himself, and wins Cornwall's battle. Afterward a song mocking King Mark is sung at Mark's court — a song composed by Dynadin. Mark is sure Tristram had a hand in this, but he can do nothing.
