As an expert in literature and history, I can provide an answer to your question. The phrase "killed by the King's horse" is a reference to a line from the play "Richard III" by William Shakespeare. In Act V, Scene III, the character Richard III is killed in the Battle of Bosworth Field. The line in question is:
"A horse! A horse! My kingdom for a horse!"
This is Richard III's desperate cry for a mount to escape his enemies, as he is overwhelmed and eventually killed. The phrase "killed by the King's horse" is not a direct quote from the play, but it could be interpreted as a metaphorical way of saying that Richard III was defeated by the forces arrayed against him, which included the horsemen of King Henry VII.
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