@oristarA,
oristarA wrote:Knight: the man who rides the horse; horseman.
Knight would refer to a minor nobleman who fought on horseback in the era before firearms.
It could also refer to those same noblemen if they were participating in the sport of jousting.
Later mounted soldiers in the era of firearms would be called cavalry, not knights.
People riding in modern horse racing wouldn't be called knights or cavalry. They'd probably be called jockeys.