Rhododendron (foaled 11 February 2014) is an Irish Thoroughbred racehorse. As a two-year-old in 2016 she was rated the joint-best filly of her generation trained in Europe, inferior only to the American filly Lady Aurelia. After finishing second on her racecourse debut she won a maiden race at Goodwood Racecourse and then recorded her first important success when taking the Group Two Debutante Stakes at the Curragh in August. She was slightly disappointing when finishing third in the Moyglare Stud Stakes but returned to her best in October to win the Fillies' Mile. As a three-year-old she finished second in both the 1000 Guineas and the Oaks before winning the Prix de l'Opéra. As a four-year-old i 2018 she added another major win in the Lockinge Stakes. Background Rhododendron is a bay filly with no white markings bred in Ireland by Orpendale, Chelston & Wynatt, breeding companies associated with the Coolmore Stud organisation. The filly was sent into training with Aidan O'Brien at Ballydoyle. Like many Coolmore horses, the official details of her ownership have changed from race to race: she has sometimes been listed as being the property of Susan Magnier, while on other occasions she has been described as being owned by a partnership of Derrick Smith, Michael Tabor and Susan Magnier. She was sired by Galileo, who won the Derby, Irish Derby and King George VI and Queen Elizabeth Stakes in 2001. Galileo is now one of the world's leading stallions and has been champion sire of Great Britain and Ireland five times. His other progeny include Cape Blanco, Frankel, Golden Lilac, Nathaniel, New Approach, Rip Van Winkle, Found Minding and Ruler of the World. Rhododendron's dam Halfway to Heaven was one of the best European fillies of her generation, winning the Irish 1,000 Guineas, Nassau Stakes and Sun Chariot Stakes in 2008. Halfway to Heaven's dam, Cassandra Go was a top class sprinter, whose wins included the King George Stakes, Temple Stakes and King's Stand Stakes and was a descendant of the Kentucky Oaks winner Native Street. As a daughter of Galileo out of a Pivotal mare she was bred on very similar lines to her stablemate and contemporary Hydrangea, against whom she raced on several occasions. Racing career 2016: two-year-old season Rhododendron had her first run in a maiden race over seven furlongs at the Curragh on 24 June. Ridden by Seamie Heffernan she started