Medieval story in poem form

Order Description

Write a story (tale) which teaches one of the Knight’s Code of Chivalry.- which is to never refuse a challenge from an equal .
Story must be written in heroic couplets ( every two lines rhyme and each line must be ten syllables long.)
Two pages (heroic couplet, single spaced)
Set in Medieval times, must tell a complete story and be about your character.
EXAMPLE:
One summer’s day as I was walking down
The path towards the nearest bustling town,
I happ’ed across a young, golden-haired maid
Who with a local farmer lived and stayed.
No sources needed.