For the historian of the Roman period, the archaeology of Central and Southern Italy raises (and sometimes provides answers to) a fascinating variety of questions. The Pontine plain and the valleys of the Liri and Sacco were the areas first affected by Roman expansion beyond the Latial plain, and it was here that the Romans tested and perfected the techniques of organization and control of territory that were to be used with such success elsewhere in Italy and eventually throughout the Mediterranean: in particular, colonization, municipalization, and the transformation of the rural landscape which accompanied them. This area too saw the development of the villa system of agriculture, which came to be predominant in Central Italy during the first century B.C., and was imitated throughout the Empire; but there were also striking differences between agricultural practices in the plains and in the mountains above. This geographical diversity was paralleled by a complex cultural mix, as aspects of both Greek and Roman culture were adopted by the local populations, who themselves moved around an increasingly unified Italy with greater ease, leading to further cultural transformations.