Tetratema (1917-1939) was a British Thoroughbred racehorse. Owned by Major Dermot McCalmont, Tetratema was bred at McCalmont's Ballylinch Stud on his Mount Juliet estate in Thomastown, County Kilkenny in Ireland. Out of the dam Scotch Gift, his sire was The Tetrarch whom the National Sporting Library's Thoroughbred Heritage website says was "probably the greatest two-year-old of all time", and that he was " possibly the greatest runner ever."

At age two, Tetratema showed his sire's speed, winning five important conditions races and earning U.K. Champion 2-Year-Old honors. At three, he won four more important races, the most significant of which was the 2,000 Guineas Classic. On the track at age four, Tetratema continued his winning ways, capturing his second consecutive King George Stakes as well as the July Cup before retiring to breeding duty at his owner's Ballylinch Stud.

A successful stallion, in 1929 Tetratema was the leading sire in Great Britain & Ireland. His sons include Mr. Jinks, winner of the 1929 2,000 Guineas, Royal Minstrel winner of the 1929 Eclipse Stakes, Fourth Hand, 1927 Irish 2,000 Guineas winner, and Four Course, winner of the 1931 1,000 Guineas. Tetratema also sired Myrobella, a multiple stakes winner and the U.K.'s 1932 Champion Two-Year-Old Filly, plus a second U.K. Champion Two-Year-Old, the colt Foray.

Tetratema died in 1939 at age twenty-two and is buried at Ballylinch Stud.

References

• Tetratema's pedigree and racing stats
• Tetratema at Thoroughbred Heritage.com