The Tetrarch (1911–1935) was an Irish-bred, British-trained Thoroughbred racehorse. He was undefeated in a racing career of seven starts and was voted the best British-trained two-year-old of the 20th century according to the National Horseracing Museum. He did not race after 1913 and was retired to stud where he became an influential sire.

Straffan is a village in County Kildare, Ireland, situated on the banks of the River Liffey, 25 km upstream of the Irish capital Dublin. As of the 2016 census, the village had a population of 853, a nearly two-fold increase since the 2006 census.