Need an opinion on the older poetic forms

[Todd]

So, I'm writing this story and posting it to the site, and I realized I made a lazy choice in the latest installment. I think I need to rework something into a poem. The language can be modern not archaic. I need something that was probably used no later than 13th century that has an older feel to it despite content. So, would it be a ballad?

Any ideas as to a good form?

Thanks,

Todd