Bay Ronald was a Thoroughbred racehorse that had a huge impact on the breeding of sport horses, mainly through his son Dark Ronald and grandson Teddy, and also carried on his lines in theThoroughbred racing world, through his son Bayardo. He appears in the pedigrees of many dressage, show jumping, and eventing horses today.

Dark Ronald was an English bred Thoroughbred racehorse and sire with a global influence on the breeding of Thoroughbreds and sport horses, with many show jumpers tracing back to him.