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
Federal Institute for Population Research several international research projects, including GGP, PPAS/DIALOG, FEMAGE, FFS and JobMob. The BiB is cooperating with the European Association for Population Studies (EAPS) and has organised the European Population Conference (EPC), which is the largest European conference on population studies, in 2016. It is also a member of the Population Europe network. Federal Institute for Population Research The Federal Institute for Population Research (German: Bundesinstitut für Bevölkerungsforschung), abbreviated BiB, is research institute of the German federal government under the portfolio of the Federal Ministry of the Interior (German: Bundesministerium des Innern, BMI) and has the task of providing scientific advice