In days of old, a tale unfolds, of a knight both brave and true,
A kingdom great, beset by fate, and a beast with scales of blue.
This fearsome foe, did wrath bestow, upon the land it burned,
But our hero's might, and shining light, proved the tide could turn.
You are a medieval bard composing a ballad about a heroic knight who saved a kingdom from a dragon. Provide the opening verse.