384 A BRIEF SURVEY OF HUMAN HISTORY and princedoms were subjected to the common foreign yoke which at once ignored and evoked national consciousness and the democratic spirit of self-determination. But before we trace the history of these two * main currents' of nine- teenth century European life, it is necessary to look at the earlier growth of at least two other countries, viz. Prussia and Russia. Germany, as we know her to-day, is a product of the nineteenth century. Even at the time of the Vienna Con- gress (1814-15) that country was a congeries of over three hundred and fifty kingdoms and principalities, of which Prussia was undoubtedly the most pre-eminent. On that historic occasion their number was reduced to thirty-nine states (by combining small states together) and they were given a formal unity under a Confederation with a com- mon Diet (Parliament) at Frankfort. The real consoli- dation of Germany was brought about by the ruling House of Hohenzollern whose family history reached back to the twelfth century. .Frederick the Great, mentioned earlier in this chapter, belonged to this family which particu- larly came - into prominence - after the Thirty Years' War, under Frederick William, known as the Great Elector (1640- .88). He was only the Duke of Brandenburg (sub- ject to the King of Poland) to begin with; but fcough war and dipilomacy he considerably increased the possessions and prestige of his House, the greatest of his acquisitions being Prussia. By internal reforms such as improvement of taxation, communications, irrigation, encouragement of edu- cation, industry and agriculture, etc. he enhanced the im- .portance of Brandenburg-Prussia in all Germany (which also contained other States like Bavaria and Saxony). His successor, Frederick II (1688-1713),. earned the title of uKing" from the Emperor Leopold I of Austria. His