Unregistered died 1898 Ghost Wind Stallion Nez Perce Owned... The Nez Perce of Washington, Oregon and Idaho became especially sophisticated horsemen, and their mounts, which included many spotted individuals, were prized and envied by other tribes. Historians believe they were the first tribe to breed selectively for specific traits - intelligence and speed - keeping the best, and trading away those that were less desirable. When white settlers came to the Northwest Palouse region, they called the spotted horses "Palouse horses" or "a Palouse horse." Over time the name was shortened and slurred to "Appalousey" and finally "Appaloosa."