After centuries of political fragmentation, a sense of German unity began to emerge in the 18th century. The Holy Roman Empire continued to decline until being dissolved altogether by Napoleon in 1806. In central Europe, the Napoleonic wars ushered in great social, political and economic changes, and catalyzed a national awakening among the Germans. By the late 18th century, German intellectuals such as Johann Gottfried Herder articulated the concept of a German identity rooted in language, and this notion helped spark the German nationalist movement, which sought to unify the Germans into a single nation state. Eventually, shared ancestry, culture and language (though not religion) came to define German nationalism. The Napoleonic Wars ended with the Congress of Vienna (1815), and left most of the German states loosely united under the German Confederation. The confederation came to be dominated by the Catholic Austrian Empire, to the dismay of many German nationalists, who saw the German Confederation as an inadequate answer to the German Question.