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
Catholic Church in Europe The Basilica of San Francesco d'Assisi is the mother church of the Order of Friars Minor, commonly known as the "Franciscan Order". Assisi is the town in which the founder of the order, Saint Francis, was born and died. Catholic Church in Europe The Catholic Church in Europe, also known as Roman Catholic Church in Europe, is part of worldwide Catholic Church in full communion with the Holy See in Rome, including represented Eastern Catholic missions. Demographically, Catholics are the largest religious group in Europe, while church attendance has declined in the past decades. About 35% of the population of