Trakehner is a light warmblood breed of horse, originally developed at the East Prussian state stud farm in the town of Trakehnen from which the breed takes its name. The de was established in 1731 and operated until 1944, when the fighting of World War II led to the annexing of East Prussia by Russia, and the town containing the stud renamed as Yasnaya Polyana. The Trakehner typically stands between . They can be any color, with bay, gray, chestnut and black being the most common, though the breed also includes few roan and tobiano pinto horses. It is considered to be the lightest and most refined of the warmbloods, due to its closed stud book which allows entry of only Trakehner, as well as few selected Thoroughbred, Anglo-Arabian, Shagya and Arabian bloodlines. Owing to its Thoroughbred ancestry, the Trakehner is of rectangular build, with a long sloping shoulder, good hindquarters, short cannons, and a medium-long, crested and well-set neck. The head is often finely chiseled, narrow at the muzzle, with a broad forehead. It is known for its "floating trot" - full of impulsion and suspension. The Trakehner possesses a strong, medium-length back and powerful hindquarters. Trakehners are athletic and trainable, with good endurance, while some are more spirited than horses of other warmblood breeds. Trakehners breed true to type, due to the purity of the bloodlines, making it valuable for upgrading other warmbloods. Old Prussians and other Baltic people such as the Lithuanians were noted for their hardy horses and cavalry during the early Middle Ages. During their conquest of Old Prussians in the 13th century Prussian crusade, the conquering Teutonic Knights named the Old Prussian horse a Schwaikenpferd, a small primitive horse. Beginning in the 14th century, knights used it to breed their military horses, and descendants of the Schwaikenpferd were later used by Masovian and Ostsiedlung farmers for light utility work.