Bonn is the 19th largest city in Germany. Located about 20 kilometres south of Cologne on the river Rhine in the Federal State of North Rhine-Westphalia, it was the capital of West Germany from 1949 to 1990 and the official seat of government of united Germany from 1990 to 1999. Starting in 1998, many national government institutions were moved from Bonn to Berlin. Both houses of the German national parliament, the Bundestag as well as the Bundesrat, were moved along with the Chancellery and the residence of German head of state, the Bundespräsident.

Bonn remains a centre of politics and administration, however. Roughly half of all government jobs were retained as many government departments remained in Bonn and numerous sub-ministerial level government agencies relocated to the former capital from Berlin and other parts of Germany. In recognition of this, the former capital now holds the title of Federal City ("Bundesstadt").

Bonn has developed into a hub of international cooperation in particular in the area of environment and sustainable development. In addition to a number of other international organizations and institutions, such as, for instance, the IUCN Environmental Law Center (IUCN ELC) the City currently hosts 16 United Nations institutions. Among these are two of the so-called Rio Conventions, the United Nations Framework Convention on Climate Change (UNFCCC) and the United Nations Convention to Combat Desertification (UNCCD). The number of UN agencies in Bonn, most of which are based at the newly established United Nations Campus in the city's former parliamentary quarter on the banks of the Rhine, continues to grow.

Bonn is the seat of some of Germany's largest corporate players, chiefly in the areas of telecommunications and logistics. Simultaneously, Bonn is establishing itself as an important national and international centre of meetings, conventions and conferences, many of which are directly related to the work of the United Nations. A new conference centre capable of hosting thousands of participants is currently under construction in the immediate vicinity of the UN Campus.

From 1597 to 1794, it was the residence of the Archbishops and Prince-electors of Cologne, and is the birthplace of Ludwig van Beethoven (born 1770).

History

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The history of the city dates back to Roman times. In about 11 BC, the Roman Army appears to have stationed a small unit in what is presently the historical centre of the town. Even earlier, the Army had resettled members of a Germanic tribal group allied with Rome, the Ubii, in Bonn. The Latin name for that settlement, "Bonna", may stem from the original population of this and many other settlements in the area, the Eburoni. The Eburoni were members of a large tribal coalition effectively wiped out during the final phase of Caesar's War in Gaul. After several decades, the Army gave up the small camp linked to the Ubii-settlement. During the 1st century AD, the Army then chose a site to the North of the emerging town in what is now the section of Bonn-Castell to build a large military installation dubbed Castra Bonnensis, i.e., literally, "Fort Bonn". Initially built from wood, the fort was eventually rebuilt in stone. With additions, changes and new construction, the fort remained in use by the Army into the waning days of the Western Roman Empire, possibly the mid-5th century AD. The structures themselves remained standing well into the Middle Ages, when they were called the Bonnburg. They were used by Frankish kings until they fell in disuse. Eventually, much of the building materials seem to have been reused in the construction of Bonn's 13th century city wall. The Sterntor (star gate) in the center of town is a reconstruction using the last remnants of the medieval city wall.