Vienna is the capital city of Austria and is located on the Danube river. It became the capital of the Austrian Empire in 1804 and hosted the Congress of Vienna in 1814–1815. Following the union of the Austrian Empire with the Kingdom of Hungary in 1867, it became the capital of the Austro-Hungarian Empire. Vienna is famously the home of Sigmund Freud and gained a reputation as a center of music and culture as Mozart, Haydn, Beethoven Schubert (actually born in Vienna), and Brahms all worked in Vienna during their careers.