Wikipedia
Tetratema (27 April 1917 – July 1939) was an Irish-bred, British-trained Thoroughbred racehorse and sire. In a racing career which lasted from May 1919 until October 1921 he won thirteen of his sixteen races, include the all twelve of his starts over the sprint distances of five and six furlongs. He was unbeaten in five races in 1919, including the Molecomb Stakes, Champagne Stakes, and Middle Park Stakes, and was the highest-rated two-year-old in Britain by a record margin. In the following year he had enough stamina to win the Classic 2000 Guineas over a mile, but failed to stay when unplaced in both the Epsom Derby and the Eclipse Stakes. He then returned to sprinting and won his remaining two races of 1920 and all four in 1921. His successes in this phase of his career included the King's Stand Stakes, July Cup and two runnings of the King George Stakes.
At the end of 1921 he was retired from racing and returned to his birthplace in Ireland to become a breeding stallion. He became a highly successful sire of winners and regularly featured among the leading sires in Britain and Ireland. Most of his best runners inherited their father's aptitudes, being particularly successful as two-year-olds and over sprint distances. Tetratema died at the age of twenty in 1939.