Burials of riders accompanied by horses are of special significance for the Prussian antiquities. This mass tradition roots back to the early Roman time and existed, slightly modified, in this area till Prussia was conquered by the Teutonic Order in the 13th century. In other words, this tradition existed in the Baltic region for over 1000 years. A horse takes an outstanding position in the Baltic mythology similarly to that of other Indo-European peoples. Numerous documents prove the important role that a horse played in Ancient Prussians’ life. Wooden saddles were found in three horse graves in Aleika-3 cemetery. Two saddles were preserved in the form of wooden fragments with carved images, which were covered with polychromatic pictures (yellow, red, brown, and black colours were used in the painting). Rear saddle arch found in the grave 521 is painted with solar rosettes, but the main accent of the saddle arch is two horses galloping to symbol of the World Tree or anthropomorphic figure in the centre of the composition. The unique artefacts found in Aleika-3 burial ground provide principally new information for understanding the details of burial ceremony and daily life of the medieval Prussians.