Ukrainians in Russia include all the family of hetman Ivan Mazepa, A. Vojnarovsky, and those in Mazepa's Cossack forces that returned to Russia. Some were imprisoned in exile for the rest of their lives such as hetmanPavlo Polubotok, Pavlo Holovaty, P. Hloba and Petro Kalnyshevsky. Beginning in the 19th century, there was a continuous migration from Belarus, Ukraine and Northern Russia to settle the distant areas of the Russian Empire. The promise of free fertile land was an important factor for many peasants who until 1861, lived under Serfdom. In the colonization of the new lands, a significant contribution was made by ethnic
Iranians in Russia and the Mountain Jews, who descend from Persian Jews from Iran. People from the former and contemporary boundaries of Iran have a long history in the territory of what is modern-day Russia, stretching back thousands of years. Throughout history, the Caucasus region was usually incorporated into the Iranian world, and large parts of it were ruled by empires based in modern-day Iran for a time span encompassing many centuries, or were under its direct influence. From the early 16th century up to including the early 19th century, Transcaucasia and a part of the North Caucasus (namely Dagestan), were ruled by