According to the aforementioned scholars the building of the fortress of Kyiv was finished in 840 under the leadership of Keő (Keve), Csák, and Geréb, three brothers, possibly members of the Tarján tribe. The three names appear in the Kyiv Chronicle as Kyi, Shchek, and Khoryv and may be not of Slavic origin, as Russian historians have always struggled to account for their meanings and origins. According to Hungarian historian Viktor Padányi, their names were inserted into the Kyiv Chronicle in the 12th century, and they were identified as old-Russian mythological heroes.