From 1309 to 1341, the Mameluke Empire was everywhere victorious and possessed the finest army in the world. For the ensuing hundred years the wealth of the Mameluke Empire was fabulous, slowly leading to luxury, the relaxation of discipline and to decline, with ever more bitter internal political rivalries. Finally the empire collap- sed in 1517, as the result of military defeat by the Ottomans. In our own lifetime, we have witnessed the same phenomenon in the U.S.A. and Britain. When these nations were at the height of their glory, Harvard, Yale, Oxford and Cambridge seemed to meet their needs. Now almost every city has its university. These poorer peoples were only too happy to migrate to the wealthy cities of the empire, and thereby, as we have seen, to adulterate the close-knit, homogeneous character of the conquering race. The latter unconsciously assumed that they would always be the leaders of mankind, relaxed their energies, and spent an increasing part of their time in leisure, amusement or sport.

The full flowering of Arab and Persian intellectualism did not occur until after their imperial and political collapse. Thereafter the intellectuals attained fresh triumphs in the academic field, but politically they became the abject servants of the often illiterate rulers. When the Mongols conqu- ered Persia in the thirteenth century, they were themselves entirely uneducated and were obliged to depend wholly on native Persian officials to administer the country and to collect the revenue. They retained as wazeer, or Prime Minister, one Rashid al- Din, a historian of international repute. Yet the Prime Minister, when speaking to the Mongol II Khan, was obliged to remain throughout the interview on his knees. At state banquets, the Prime Minister stood behind the Khan’s seat to wait upon him. If the Khan were in a good mood, he occasionally passed his wazeer a piece of food over his shoulder.The people of the great nations of the past seem normally to have imagined that their pre-eminence would last for ever. Rome appeared to its citizens to be destined to be for all time the mistress of the world. The Abbasid Khalifs of Baghdad declared that God had appointed them to rule mankind until the day of judgement. Seventy years ago, many people in Britain believed that the empire would endure for ever. Although Hitler failed to achieve his objective, he declared that Germany would rule the world for a thousand years. That sentiments like these could be publicly expressed without evoking derision shows that, in all ages, the regular rise and fall of great nations has passed unperceived. The simplest statistics prove the steady rotation of one nation after another at regular intervals. Royle, Trevor. Glubb Pasha: The Life and Times of Sir John Bagot Glubb, Commander of the Arab Legion (Little, Brown, 1991). The Age of Commerce is also marked by great enterprise in the exploration for new forms of wealth. Daring initiative is shown in the search for profitable enterprises in far corners of the earth, perpetuating to some degree the adventurous courage of the Age of Conquests. XIII The Age of Affluence There is some value in comparing the lives of nations to those of individuals. No two persons in the world are identical. Moreover their lives are often affected by accidents or by illness, making the divergences even more obvious. Yet, in fact, we can generalise about human life from many different aspects. The characteristics of childhood, adolescence, youth, middle and old age are well known. Some adolescents, it is true, are prematurely wise and serious. Some persons in middle age still seem to he young. But such exceptions do not invalidate the general character of human life from the cradle to the grave. All these periods reveal the same characteristics. The immense wealth accu- mulated in the nation dazzles the onlookers. Enough of the ancient virtues of courage, energy and patriotism survive to enable the state successfully to defend its frontiers. But, beneath the surface, greed for money is gradually replacing duty and public service. Indeed the change might be summarised as being from service to selfishness.

Lunt, James (1984). Glubb Pasha, a Biography: Lieutenant-General Sir John Bagot Glubb, Commander of the Arab Legion, 1939–1956. London: Harvill Press. p.42. ISBN 9780002726382 . Retrieved 4 April 2023. But the objection may here be raised that some day the time will come when all the races of the world will in turn have enjoyed their period of domination and have collapsed again in decadence. When the whole human race has reached the stage of decadence, where will new energetic con- quering races be found?The experiences of the human race have been recorded, in more or less detail, for some four thousand years. If we attempt to study such a period of time in as many countries as possible, we seem to discover the same patterns constantly repeated under widely differing conditions of climate, culture and religion. Surely, we ask ourselves, if we studied calmly and impartially the history of human institutions and development over these four thousand years, should we not reach conclusions which would assist to solve our problems today? For everything that is occurring around us has happened again and again before. Another remarkable and unexpected symptom of national decline is the intensi- fication of internal political hatreds. One would have expected that, when the survival of the nation became precarious, political factions would drop their rivalry and stand shoulder-to-shoulder to save their country. Physical science has expanded its knowledge by building on the work of its predecessors, and by making millions of careful experi- ments, the results of which are meticulously recorded. Such methods have not yet been employed in the study of world history. Our piecemeal historical work is still mainly dominated by emotion and prejudice. II The lives of empires In the first half of the ninth century, Baghdad enjoyed its High Noon as the greatest and the richest city in the world. In 861, however, the reigning Khalif (caliph), Mutawakkil, was murdered by his Turkish mercenaries, who set up a military dictator- ship, which lasted for some thirty years. During this period the empire fell apart, the various dominions and provinces each assuming virtual independence and seeking its own interests. Baghdad, lately the capital of a vast empire, found its authority limited to Iraq alone.