Tom O'Bedlam (excerpt)

With a host of furious fancies
Whereof I am commander,
With a burning spear and a horse of air,
To the wilderness I wander.

 By a knight of ghostes and shadowes
I summon’d am to tourney
Ten leagues beyond the wild world’s end.
Methinks it is no journey.

— anonymous / traditional

(you can find the entire poem here)