Sir Gawain and the Green Knight by Michael Morpurgo illustrated by Michael Foreman

Sir Gawain, one  of King Arthur's knights of the Round Table, acts bravely on behalf of his beloved king one New Year's Eve.  A Green Knight challenges the King and his Knights to a contest.  Sir Gawain accepts.  His integrity and courage are tested to the fullest.
This is story is told in a captivating way and is very well written.  I hesitate to recommend it to any elementary age student since the Green Knight's wife tries to seduce Sir Gawain three times.  The Green Knight's wife kisses him several times throughout the story which I consider adultery.  Sir Gawain also chops off the Green Knight's head and there is an illustration showing the head falling off and blood squirting out of it plus the Green Knight holding his decapitated head.
Warnings/points to discuss: adultery, seduction, violence
**Longer picture book-more words than illustrations