"She was betrayed!  Her sister, Celestia, ruled the day - and like the blazing sun, she cast her glare into every crack it could reach.  With sweet words she wooed the nobility and wound the ponies of the land around her hoof.  They glorified her, flocked to her, worshiped her, and her sister was forced, slowly but surely, into the shadows.  Princess Luna was patient but wise, and she saw through her sister's scheming.  But when she confronted Celestia, her sister refused to give up any of what she'd taken.  She sought to keep all the power to herself."