Final answer:
After Lanval returns to Arthur's court, a new conflict occurs when Queen Guinevere falsely accuses him of making inappropriate advances towards her. Lanval proves his innocence through a trial defended by the fairy queen.
Step-by-step explanation:
After Lanval returns to Arthur's court, a new conflict occurs when Queen Guinevere falsely accuses Lanval of making inappropriate advances towards her. This leads to a trial where Lanval is defended by the fairy queen and ultimately proves his innocence by showing her magical powers. The conflict highlights the theme of courtly love and the power dynamics within Arthur's court.