Siege of Esztergom (1241) other European states, bar Moravia, Bohemia, and the Polish duchies, which the Mongols dealt with separately. Bela's kingdom was ill-prepared for the Mongol invasion. At the time, Hungary was one of the poorest and most sparsely populated areas of Europe. The population was estimated at slightly over 2 million in the mid-thirteenth century despite its large land area, with the largest city, Esztergom, having only 12,000 inhabitants. Its armies consisted primarily of light cavalry with some light infantry, and only a handful of crossbowmen, mounted knights, and heavy infantry, in contrast to the areas further west where such troops were
Geography of the European Union has the lowest birth rate in Europe with 8.221 births per thousand people per year. The European Union is home to more global cities than any other region in the world. Over 16 cities with populations over one million inhabitants, counted in its city proper. Densely populated regions that have no single core but have emerged from the connection of several cities and are now encompassing large metropolitan areas are Rhine-Ruhr having approximately 11.5 million inhabitants (Cologne, Düsseldorf, et al.), Randstad approx. 7 million (Amsterdam, Rotterdam, The Hague et al.), the Flemish Diamond approx. 5.5 million, Frankfurt/Rhine-Main approx. 4 million