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
Demographics of Russia live within the Russian Federation's borders. Russia's population density is 8.4 people per square kilometre (22 per square mile), making it one of the most sparsely populated countries in the world. The population is most dense in the European part of the country, with milder climate, centering on Moscow and Saint Petersburg. 74% of the population is urban, making Russia a highly urbanized country. The population of Russia peaked at 148,689,000 in 1991, just before the breakup of the Soviet Union. Low birth rates and abnormally high death rates caused Russia's population to decline at a 0.5% annual rate, or