In addition to the early Rus', Pritsak's works focused on Eurasian nomads and steppe empires such as those created by the Bulgars, Khazars, Pechenegs, and Kipchaks.
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Unlike his predecessors Mykhailo Hrushevsky, Dmytro Doroshenko, and Ivan Krypiakevych, who wrote national histories or histories of the Ukrainian people, Pritsak followed the Ukrainian historian of Polish background, Viacheslav Lypynsky, in proposing the ideal of writing a "territorialist" history of Ukraine which would include the Polish, Turkic, and other peoples that have inhabited the country from ancient times.
Norman Golb and Omeljan Pritsak, Khazarian Hebrew Documents of the Tenth Century. Ithaca: Cornell Univ.