However, there's no widely known or documented historical account of a queen's blood being sprinkled on horses. It's possible you're thinking of a specific story or myth that's not as well-known.
To help me figure out what you might be thinking of, could you please provide some more context?
For example:
* Where did you hear this? Was it in a book, a movie, a song, or from someone you know?
* What is the story about? What is the purpose of sprinkling the blood? Is it a ritual, a curse, or something else?
* What kind of queen are we talking about? Is she a real historical figure, or a mythical character?
With more information, I might be able to help you find the story you're looking for!