Treve is a French Thoroughbred racehorse who was the 2013 European Horse of the Year after being unbeaten in four races as a three-year-old. These included the Prix de Diane, Prix Vermeille and Prix de l'Arc de Triomphe.

The Fugue is a British Thoroughbred racehorse who was named European Champion three-year-old filly at the Cartier Racing Awards. She won her only race as a two-year-old in 2011 before developing into one of the best fillies in Europe in the following season. She won the Musidora Stakes at York and the Nassau Stakes and was considered an unlucky loser in both the Oaks Stakes and the Breeders' Cup Filly & Mare Turf. In 2013, The Fugue won the Yorkshire Oaks before recording her biggest win in the Irish Champion Stakes. She then travelled to California to compete for a second time at the Breeders' Cup, finishing second in the Turf. As a five-year-old, she defeated a strong field to win the Prince of Wales's Stakes at Royal Ascot but was retired after suffering an injury in the Eclipse Stakes. She won six of her seventeen races, including four at Group One level.