The Knight of Lancaster or Something

Ruby always loved her fairy tales, especially the romantic ones of noble knights and royal maidens. A pity hers doesn't fit the cliches so neatly, but that's what happens when you prefer guns to gowns and your Prince Charming is mostly that way by accident. Just who is the knight of Lancaster here, anyway? (A young girl's tale of first love, fidelity, and the fate of the Kingdom.)