he Holy Roman Emperor Sigismund. Petr Chelčický continued with Czech Hussite Reformation movement. During the next two centuries, 90% of the inhabitants became adherents of the Hussite Christian movement.
After 1526 Bohemia came increasingly under Habsburg control as the Habsburgs became first the elected and then the hereditary rulers of Bohemia. The Defenestration of Prague and subsequent revolt against the Habsburgs in 1618 marked the start of the Thirty Years' War, which quickly spread throughout Central Europe. In 1620, the rebellion in Bohemia was crushed at the Battle of White Mountain, and the ties between Bohemia and Habsburgs' hereditary lands in Austria were strengthened. The war had a devastating effect on the local population; the people were given the choice either to convert to Catholicism or leave the country.
The following period, from 1620 to the late 18th century, has been often called the "Dark Age". The population of the Czech lands declined by a third through war, disease, famine and the expulsion of the Protestant Czechs. The Habsburgs banned all religions other than Catholicism. Ottoman Turks and Tatars invaded Moravia in 1663. In 1679–1680 the Czech lands faced a devastating plague and an uprising of serfs.
The reigns of Maria Theresa of Austria and her son Joseph II, Holy Roman Emperor and co-regent from 1765, were characterized by enlightened absolutism. In 1742, most of Silesia, then the possession of the Bohemian crown, was seized by King Frederick II of Prussia in the War of the Austrian Succession. The Great Famine, which lasted from 1770 until 1771, killed about one tenth of the Czech population, or 250,000 inhabitants, and radicalized countrysides leading to peasant uprisings.
After the fall of the Holy Roman Empire, Bohemia became part of the Austrian Empire and later of Austria–Hungary. Serfdom was not completely abolished until 1848. After the Revolutions of 1848, Emperor Franz Josef I of Austria
