Yuri Dolgorukiy
During this time, the Cumans raided the Byzantine Empire and Volga Bulgaria. Volga Bulgaria was attacked again at a later stage, by Khan Ayepa, father-in-law of Grand Prince of Kiev Yuri Dolgorukiy, perhaps at his instigation. The Volga Bulgars in turn poisoned Ayepa "and the other princes; all of them died." In 1089, Ladislaus I of Hungary defeated the Cumans after they attacked the Kingdom of Hungary. In 1091, the Pechenegs, a semi-nomadic Turkic people of the prairies of southwestern Eurasia, were decisively defeated as an independent force at the Battle of Levounion by the combined forces of a Byzantine army under Emperor Alexios I Komnenos and a Cuman army under Togortok/Tugorkan and Boniak. Attacked again in 1094 by the Cumans, many Pechenegs were again slain. Some of the Pechenegs fled to Hungary, as the Cumans themselves would do a few decades later. In 1091/1092 the Cumans, under Kopulch, raided Transylvania and Hungary, moving to Bihor and getting as far as the Tisza and Timiș rivers. Loaded with goods and prisoners they then split into three groups, after which they were attacked and defeated by King Ladislaus I.