As of 2017, which was the last horse to accomplish the feat of sweeping the English Triple Crown?

The English Triple Crown consists of the 2000 Guineas Stakes (at 1 mile), The Derby (at 1½ miles), and the St. Leger Stakes (at 1 mile 6 furlongs and 127 yds) although the distances have varied throughout the years.

Nijinsky (21 February 1967 – 15 April 1992), usually known in the United States as Nijinsky II, was a Canadian-bred, Irish-trained Thoroughbred racehorse and sire. He was the outstanding two-year-old in Europe in 1969 when he was unbeaten in five races. In the following season he became the first horse for thirty-five years to win the English Triple Crown. As of 2017, he is the last horse to accomplish the feat of sweeping the English Triple Crown: since 1970 only Reference Point (1987), Nashwan (1989), Sea The Stars (2009) and Camelot (2012) have won two of the three races, but Oh So Sharp won the filly's version of the Triple Crown in 1985.

He is regarded by many experts to have been the greatest flat racehorse in Europe during the 20th century.