The document discusses the history of Eastern Europe and Russia from 500 AD to the 1500s. It describes how Slavic people settled in Eastern Europe in 500 AD and formed three major groups. It then discusses the rise of the Kievan Rus state centered around Kiev in the 800s, which grew and attracted Byzantine missionaries. The Mongol invasion in 1240 conquered all of Kievan Rus except Novgorod. Moscow later emerged as the center of the growing Grand Duchy of Moscow and the Russian Orthodox Church. Ivan III ended Mongol rule and expanded the territory of Kievan Rus.