Kiev is one of the oldest and most important cities of Eastern Europe and has played a pivotal role in the development of the medieval East Slavic civilization as well as in the modern Ukrainian nation. Human settlement at the site of the present day city may have occurred as early as the fifth or the sixth century AD.[3] With the exact time of city foundation being hard to determine, May 1982 was chosen to celebrate the city's 1,500th anniversary. During the eighth and ninth centuries, Kiev was an outpost of the Khazar empire. Starting in the late ninth century Kiev was ruled by the Varangian nobility and became the nucleus of the Rus' polity, whose Golden Age (eleventh to early twelfth centuries) has from the nineteenth century become referred to as Kievan Rus'. In 1240 the Mongol invasion of Rus led by Batu Khan completely destroyed Kiev, an event that had a profound effect on the future of the city and the East Slavic civilization. At the time of the Mongol destruction, Kiev was reputed as one of the largest cities in the world, with a population exceeding one hundred thousand. The Podol (Podil) neighborhood of Kiev. 1890 postcard.In 1321, the greatly diminished city and surrounding area was conquered by Gediminas for the Grand Duchy of Lithuania. From 1569 the city was controlled by the Polish-Lithuanian Commonwealth, as a capital of Kij??w Voivodeship, transferred by then to the Polish Crown. In the 17th century, Kiev was transferred under rule of Russia. In the Russian Empire Kiev was a primary Christian centre, attracting pilgrims, and the cradle of many of the empire's most important religious figures, but until the 19th century the city's commercial importance remained marginal.