Michael Landon, who portrayed Charles Ingalls on Little House on the Prairie, could actually ride a horse. Prior to appearing on Little House on the Prairie, he appeared on television shows such as Bonanza where he was also often riding a horse as well.
In real life, Charles Ingalls was most often associated with driving a team of horses on a wagon. But on the television show, the television version of Charles Ingalls horseback much more often, and it was actually Michael Landon riding the horse, not a stunt double.