Coke Roberds and Si Dawson were both born in 1870, grew up on ranches and were life-long friends. They both moved to ranches in Routt County, Colo., shortly after the turn of the 20th Century, and raised cattle and horses. They were passionate about finding and raising the best possible horses for ranch work and racing. In 1914, 16-year-old Marshall Peavy acquired a nearby ranch and immediately shared his neighbors' passion for breeding the best...