From 1890 to 1950, this breed was developed in Estonia at the Tori stud. It was developed by crossing native Estonian mares with European halfbred stallions. This breed was mainly founded by a stallion named Hetman, whose sire was Stewart, a crossbreed of a Norfolk Trotter and an Anglo-Norman mare. The Tori breed was formed by breeding Hetman and his sons. Thus, a valuable breeding nucleus rapidly formed, that slowed as signs of inbreeding depression were found in the 1930s. This deteriorated performance and robustness. To eliminate this inbreeding depression, Toris were crossed with Breton Post-horse stallions, and as a result, the massive type of Tori became widespread while the quality of the gaits declined. The need for a combination of utility and sporting qualities in horse led to crossings with Hanoverian and Trakehner stallions. Recent horse breeders have been trying mainly to get a very light sport horse-type of horse, resulting in a rapid loss of purebred Tori. There are fewer than 100 purebreds and only three purebred studs remaining.