Today few scholars would dispute that archaeological evidence is indispensable for the study of Roman agriculture ; most would also accept the validity of comparisons between literary and archaeological evidence. However, the ambiguity of much archaeological evidence, especially from field survey, has meant that so far there are no agreed criteria for interpreting this material. The present paper offers a new methodology for interpreting survey evidence, and in doing so will aim to demonstrate the potential value of an archaeological approach to Roman agrarian history. Section 1 presents a hypothesis based on literary evidence about the decline of 'SMP (the slave mode of production)'. The importance of free casual labour for a slavestaffed villa, in terms of economic efficiency, is widely accepted, and the source of the free labour is usually considered to be the free peasants living near the villa. Thus it is assumed that villas and small farms had a mutually complementary relationship. However, inhabitants=@of a city within easy reach (approximately within 6km) of the villa should also be taken into consideration as a source of free labour. In either case, there is a possible correlation between a decline in these sources of labour and the loss of economic viability of SMP. Section 2 presents a basic working method, using field survey data, for proving the decrease of free peasants, and thereby for verifying the above hypothesis. All sites of each survey area are separated into three classes (Class V [villa], Class F [farm], and Class H [hut], basically according to Potter's classification) and the diachronic trends such as accumulation of lands can be seen by comparing the fluctuation of the number of V-sites with that of F-sites. In addition, some serious problems involved in using archaeological evidence, such as the dating of sites by domestic pottery, are noted, and some methods to overcome them are suggested. Section 3, based on this methodology, treats four survey areas in Italy and tries to analyse the agricultural structure of each, incorporating literary evidence. The results of each analysis are compared with one another, yielding the following points : 1) In the ager Cosanus, the decrease of small farms in the late Republican and the early Imperial period was proved, and the hypothesis thus receives some corroboration. The coexistence of villas and farms, however, enabled the conversion from SMP to tenancy after the '1C crisis' (of Rostovtzeff). 2) In the Biferno Valley in Molise, the diversification of agriculture (mixed farming and polyculture) not only lessened the shock of the crisis, but also enabled the shift from cultivation of grapes and olives to pasturage. 3) At the piedmont of Massico in northern Campania, the interdependence of slavestaffed villas and a port city, established after the villas drove out the small farms, was inflexible and vulnerable to the crisis. The vicious circle of the decrease of wine exports and the decreasing population of the city seems to have been the main cause of the rapid decline of the area's economy. Besides, monoculture of vine-cultivation made the conversion to other types of land use extremely difficult. 4) In south Etruria, agriculture was wholly dependent on the city of Rome. A pattern of suburban agriculture including such phenomena as pastiones villaticae developed ; there was a constant influx of population from the city. Thus the fluctuation of the number of sites in south Etruria reflects the rise and fall of the city of Rome.
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