sentences:  Rudolf IV introduced the first wine tax, "Ungeld", in 1359, as Vienna established itself as a centre for wine trading on the Danube.The wine business boomed in the 16th century, but the Thirty Years War and others of the 17th century took their toll, as much due to the heavy taxation of the period as the direct disruption of war.Various drink taxes were unified in 1780, as part of a drive by Maria Theresa and Joseph II to encourage viticulture.