From the third century onwards the Persian Empire had been the steadfast rival of the Byzantine. The two empires kept Asia Minor, Syria and Egypt in a state of perpetual unrest and waste. In the first century A.D., these lands were still at a high level of civilization, wealthy and with an abundant population, but the continual coming and going of armies, massacres, looting and war taxation wore them down steadily until only shattered and ruinous cities remained upon a countryside of scattered peasants. In this melancholy process of impoverishment and disorder lower Egypt fared perhaps less badly than the rest of the world. Alexandria, like Constantinople, continued a dwindling trade between the east and the west. THE CHURCH (NOW A MOSQUE) OF S. SOPHIA, CONSTANTINOPLE THE CHURCH (NOW A MOSQUE) OF S. SOPHIA, CONSTANTINOPLE The obelisk of Theodosius in in the foreground statue on left _Photo: Sebah & Foaillier_ Science and political philosophy seemed dead now in both these warring and decaying empires. The last philosophers of Athens, until their suppression, preserved the texts of the great literature of the past with an infinite reverence and want of understanding. But there remained no class of men in the world, no free gentlemen with bold and independent habits of thought, to carry on the tradition of frank statement and enquiry embodied in these writings. The social and political chaos accounts largely for the disappearance of this class, but there was also another reason why the human intelligence was sterile and feverish during this age. In both Persia and Byzantium it was all age of intolerance. Both empires were religious empires in a new way, in a way that greatly hampered the free activities of the human mind. THE MAGNIFICENT ROOF-WORK IN S. SOPHIA THE MAGNIFICENT ROOF-WORK IN S. SOPHIA _Photo: Sebah & Foaillier_