Empire and the Sassanian Empire. Political transformations The Late Antique period also saw a wholesale transformation of the political and social basis of life in and around the Roman Empire. The Roman citizen elite in the 2nd and 3rd centuries, under the pressure of taxation and the ruinous cost of presenting spectacular public entertainments in the traditional cursus honorum, had found under the Antonines that security could only be obtained by combining their established roles in the local town with new ones as servants and representatives of a distant Emperor and his traveling court. After Constantine centralized the government in his new capital of Constantinople (dedicated in 330), the Late Antique upper classes were divided among those who had access to the far-away centralized administration (in concert with the great landowners), and those who did not—though they were well-born and thoroughly educated, a classical education and the election by the Senate to magistracies was no longer the path to success. Room at the top of Late Antique society was more bureaucratic and involved increasingly intricate channels of access to the emperor: the plain toga that had identified all members of the Republican senatorial class was replaced with the silk court vestments and jewelry associated with Byzantine imperial iconography. Also indicative of the times is the fact that the imperial cabinet of advisors came to be known as the consistorium, or those who would stand in courtly attendance upon their seated emperor, as distinct from the informal set of friends and advisors surrounding the Augustus. Cities The later Roman Empire was in a sense a network of cities. Archaeology now supplements literary sources to document the transformation followed by collapse of cities in the Mediterranean basin. Two diagnostic symptoms of decline—or as many historians prefer, 'transformation'—are subdivision, particularly of expansive formal spaces in both the domus and the public basilica, and encroachment, in which artisans' shops invade the public thoroughfare, a transformation that was to result in the souk (marketplace). Burials within the urban precincts mark another stage in dissolution of traditional urbanistic discipline, overpowered by the attraction of saintly shrines and relics. In Roman Britain, the typical 4th- and 5th-century layer of dark earth within cities seems to be a result of increased gardening in formerly urban spaces. The city of Rome went from a population of 800,000 in the beginning of the period to a population of 30,000 by