[2] The filly who would become known as Briseis was scheduled to make her debut as "Gen. Grosvenor's b. f. by Beningbrough out of Lady Jane" in a 100 guinea match race on 2 April at the Craven meeting at Newmarket Racecourse.
[4] Two days later at the same course, Briseis won a Sweepstakes over ten furlongs when she defeated the Duke of St Albans' filly Morgiana for 50 guineas after "a good race".
Ridden by Sam Chifney, Jr., Briseis took the lead after a mile and won the classic by half a length from Margaret,[6] with Pantina third and Lauretta finishing unplaced.
On 10 August she contested the Gold Cup over two miles at Nottingham Racecourse in which she sustained her first defeat in a competitive race when finishing second of the six runners behind a horse named Gustavus (not the Derby winner).
During her fourteen-year stud career she produced eleven live foals (all of them bay or brown) for leading owners including John Udney, Thomas Thornhill and the Duke of Grafton.
Her next foal was Blue Stockings, by Popinjay, a filly whose wins included the Riddlesworth Stakes, at that time regarded as equal in importance to the classics.