Pechora River
As an eyewitness, Nestor could only have described the reigns of Vsevolod I and Svyatopolk II (1078–1112), but it is surmised he could have gathered many details from older inhabitants. Two such possibilities are Giurata Rogovich of Novgorod, who could have provided him with information concerning the north of Kievan Rus', the Pechora River, and other places, as well as Yan Vyshatich, a nobleman who died in 1106 at the age of ninety. Nestor provided valuable ethnological details of various Slavic tribes.