The St. Leger is a prestigious horse race held annually in the United Kingdom, specifically at Doncaster Racecourse. Established in 1776, it is one of the five classic races in British horse racing and is open to three-year-old thoroughbreds. The race covers a distance of 1 mile and 6 furlongs, making it the longest of the classics. Traditionally run in September, the St. Leger is part of the British flat racing season and attracts significant attention from racing enthusiasts. It is named after Anthony St. Leger, who was instrumental in its creation. Winning the St. Leger is considered a significant achievement in the world of horse racing.