Hamburg, officially Freie und Hansestadt Hamburg, is the second largest city in Germany and the eighth largest city in the European Union. It is also the thirteenth largest German state. It is home to over 1.8 million people, while the Hamburg Metropolitan Region has more than 5 million inhabitants. On the river Elbe, the port of Hamburg is the second largest port in Europe and tenth largest worldwide.The official name reflects its history as a member of the medieval Hanseatic League, as a free imperial city of the Holy Roman Empire, and that it is a city-state, and one of the 16 states of Germany. Before the 1871 Unification of Germany, it was a fully sovereign state. Prior to the constitutional changes in 1919, the stringent civic republic was ruled by a class of hereditary grand burghers or Hanseaten.Hamburg is a major transport hub and is one of the most affluent cities in Europe. It has become a media and industrial centre, with plants and facilities belonging to Airbus, Blohm + Voss and Aurubis. The radio and television broadcaster Norddeutscher Rundfunk and publishers such as Gruner + Jahr and Spiegel-Verlag are pillars of the important media industry in Hamburg. Hamburg has been an important financial centre for centuries, and is the seat of the world's second oldest bank, Berenberg Bank. There are more than 120,000 enterprises.The city is a major tourist destination for both domestic and overseas visitors; it ranked 17th in the world for livability in 2012, and in 2010 it ranked 10th in the world.