It is a Bavarian city of about 150 000 inhabitants, situated at the Danube, where commercial crossroads have been meeting for over 2000 years. The historical importance culminated in the middle ages, when it was a free city and one of the richest in Europe.
“The Old Town Regensburg” holds the status of a UNESCO World Heritage Site since 2006 and is per website “the only authentically preserved large medieval city in Germany”.
A permanent meeting and conferencing of European ambassadors, called ”The permanent Imperial Diet” was held up and busy to settle affairs and disputes about the European territory in the 17th and 18th century. The status of the city then could be compared to the role of Brussels for the European Community now. Napoleon ended this period, the Holy Roman Empire was dissolved and Regensburg was integrated in Bavaria.