wars, and earthquakes have come to be regarded as a blessing to overcrowded nations since they serve to prune away the luxuriant growth of the human race." Ibn Khaldun, a North African polymath (1332–1406), considered population changes to be connected to economic development, linking high birth rates and low death rates to times of economic upswing, and low birth rates and high death rates to economic downswing. Khaldoun concluded that high population density rather than high absolute population numbers were desirable to achieve more efficient division of labour and cheap administration. During the Middle Ages in Christian Europe, population issues were rarely discussed in isolation. Attitudes were generally pro-natalist in line with the Biblical command, "Be ye fruitful and multiply." 16th and 17th centuries European cities grew more rapidly than before, and throughout the 16th century and early 17th century discussions on the advantages and disadvantages of population growth were frequent. Niccolò Machiavelli, an Italian Renaissance political philosopher, wrote, "When every province of the world so teems with inhabitants that they can neither subsist where they are nor remove themselves elsewhere... the world will purge itself in one or another of these three ways," listing floods, plague and famine. Martin Luther concluded, "God makes children. He is also going to feed them." Jean Bodin, a French jurist and political philosopher (1530–1596), argued that larger populations meant more production and more exports, increasing the wealth of a country. Giovanni Botero, an Italian priest and diplomat (1540–1617), emphasized that, "the greatness of a city rests on the multitude of its inhabitants and their power," but pointed out that a population cannot increase beyond its food supply. If this limit was approached, late marriage, emigration, and the war would serve to restore the balance. Richard Hakluyt, an English writer (1527–1616), observed that, "Through our longe peace and seldom sickness... we are grown more populous than ever heretofore;... many thousands of idle persons are within this realme, which, having no way to be sett on work, be either mutinous and seek alteration in the state, or at least very burdensome to the commonwealth." Hakluyt believed that this led to crime and full jails and in A Discourse on Western Planting (1584), Hakluyt advocated for the emigration of the surplus population. With the onset of the Thirty Years' War (1618–48), characterized by widespread devastation and deaths brought on by hunger and disease in Europe, concerns