Europe of population are Saint Petersburg, Madrid, Berlin and Rome, each having over 3 million residents. When considering the commuter belts or metropolitan areas, within the EU (for which comparable data is available) London covers the largest population, followed in order by Paris, Madrid, Barcelona, Berlin, the Ruhr area, Rome, Milan, Athens and Warsaw. "Europe" as a cultural concept is substantially derived from the shared heritage of the Roman Empire and its culture. The boundaries of Europe were historically understood as those of Christendom (or more specifically Latin Christendom), as established or defended throughout the medieval and early modern history of
Population transfer loss of substantial amounts of movable property, is implied. This transfer may be motivated by the more powerful party's desire to make other uses of the land in question or, less often, by disastrous environmental or economic conditions that require relocation. In Europe, the last major population transfer was the deportation of 800,000, and displacement of 250,000 other ethnic Albanians, during the Kosovo war in 1999. The single largest population transfer in history was the flight and expulsion of Germans after World War II, which involved more than 12 million people. Moreover, some of the largest population transfers in Europe