Sir Peter Teazle was a brown horse bred and owned by Edward Smith-Stanley, 12th Earl of Derby.

Sir Peter Teazle's dam, Papillon, was by Snap, himself on the Leading Sire list four times and a great producer of raw speed.

Papillon had some success as a racehorse, finishing third out of 22 in the 1773 Craven Stakes, losing to Firetail and Miss Timms.

Sir Peter was her 7th out of 12 living foals, and one of several winners she produced, including the filly Lady Teazle (1781), who was second in The Oaks and won 11 races during her career.

Sir Peter then lost to Mulberry (by Florizel), who was carrying 28 lbs less, over the four mile Beacon course at Newmarket.

Sir Peter stood at Derby's Knowsley Stud in Lancashire, where he had great success in the breeding shed.