In the early homes of those Northmen who had long before ravaged the coasts of England and France and southern Italy and had colonized Iceland and Greenland, were situated in 1500 three kingdoms, Denmark, Norway, and Sweden, corresponding generally to the present-day states of those names. The three countries had many racial and social characteristics in common, and they had been politically joined under the king of Denmark by the Union of Calmar in 1397. This union never evoked any popularity among the Swedes, and after a series of revolts and disorders extending over fifty years, Gustavus Vasa (1523-1560) established the independence of Sweden. Norway remained under Danish kings until 1814. [Sidenote: The Slavs in Central and Eastern Europe] East of the Scandinavian peninsula and of the German-speaking population of central Europe, spread out like a great fan, are a variety of peoples who possess many common characteristics, including a group of closely related languages, which are called Slavic. These Slavs in the year 1500 included (1) the Russians, (2) the Poles and Lithuanians, (3) the Czechs, or natives of Bohemia, within the confines of the Holy Roman Empire, and (4) various nations in southeastern Europe, such as the Serbs and Bulgars. [Sidenote: Russia in 1500] The Russians in 1500 did not possess such a huge autocratic state as they do to-day. They were distributed among several principalities, the chief and center of which was the grand-duchy of Muscovy, with Moscow as its capital. Muscovy's reigning family was of Scandinavian extraction but what civilization and Christianity the principalities possessed had been brought by Greek missionaries from Constantinople. For two centuries, from the middle of the thirteenth to the middle of the fifteenth, the Russians paid tribute to Mongol [Footnote: The Mongols were a people of central Asia, whose famous leader, Jenghiz Khan (1162-1227), established an empire which stretched from the China Sea to the banks of the Dnieper. It was these Mongols who drove the Ottoman Turks from their original Asiatic home and thus precipitated the Turkish invasion of Europe. After the death of Jenghiz Khan the Mongol Empire was broken into a variety of "khanates," all of which in course of time dwindled away. In the sixteenth century the Mongols north of the Black Sea succumbed to the Turks as well as to the Russians.] khans who had set up an Asiatic despotism north of the Black Sea. The beginnings of Russian greatness are traceable to Ivan III, the Great (1462-1505), [Footnote: Ivan IV (1533-1584), called "The Terrible," a successor of Ivan III, assumed the title of "Tsar" in 1547.] who freed his people from Mongol domination, united the numerous principalities, conquered the important cities of Novgorod and Pskov, and extended his sway as far as the Arctic Ocean and the Ural Mountains. Russia, however, could hardly then be called a modern state,