In 2011 it was unveiled, that the Official Wine Classification in the Rheingau has a 150 years history. The classification was the basis for taxation of wineries after the annexation of the Duchy of Nassau by the Kingdom of Prussia in 1866. In the book Der nassauische Weinbau published in 1867 by Friedrich Wilhelm D�nkelberg a historical map Weinbau-Karte des nassauischen Rheingaus (Viticultural map of the Rheingau in the Duchy of Nassau), all known vineyards at that time had been mrked up by colour, evaluated and classified in first class vineyards (I. Klasse), second class vineyards (II. Klasse) and the remaining vineyards
