Rupen was the Count of Iveria. Like many heads of state, Rupen wanted to use unicorns in his cavalry, but he had no idea how to prevent sexually-active riders from being overcome by arousal.
When Rupen learned of Coradin Honeymouth, a mercenary unicorn-rider who was notorious for his wenching, and yet did not suffer the arousal problem, he was determined to learn the rider's secret. Rupen sent his seneschal, Milo, to offer Coradin substantial sums of money for his secret. While Coradin was not forthcoming with the truth, he did agree to enter Rupen's employ in the count's upcoming battle with rival lord Gui.