productive arable farming systems could and did evolve during the course of the thirteenth century.3 On a larger geographical scale Langdon has shown that from the mid-twelfth century an increased usage of the horse began to have a significant impact upon traction and haulage.4 Substitution of the horse for the ox in ploughing made particular progress on peasant holdings and allowed an intensification of arable production, the development of more specialized types of livestock husbandry, and an improvement in labour productivity. Its effect upon road transport was still greater. Not only was the horse more widely adopted in carting than in ploughing, but the economic dividends of this substitution were more immediate and direct: it accelerated the circulation of goods and extended the range of market transfers. In short, it was integral to the growing commercialization of the economy and for that reason made most progress in those parts of the country-notably East Anglia and the south-east-which were most deeply involved in the burgeoning market nexus.5 These developments in agriculture are symptomatic of an emergent ruralurban complex and this ties in with what is now known about the scale of late thirteenth-century English urbanism. Thus, Keene has shown convincingly that London c. I300 was possibly the second largest European city north of the Alps, with a population of perhaps go-Ioo,ooo.6 Winchester and Norwich have also been shown to have been much more populous than was formerly thought.7 These substantial urban populations cannot but have I I am grateful for research assistance received from Gill Alexander, Jenitha Orr, and John Power. Part of the research upon which this paper is based was undertaken whilst in the tenure of a Personal Research Fellowship of the Economic and Social Research Council. 2 The case for technological progress in medieval agriculture is most strongly stated by White in his Medieval technology; see also Hallam, Rural England. Nevertheless, it is the contrary view which is implicit in much writing on the subject, most notably Fussell, 'Social change but static technology'; Titow, English rural society, and Postan, The medieval economy. 3Campbell, 'Agricultural progress'. 4 Langdon, Horses, oxen and technological innovation; idem, 'Horse hauling'. 5 Britnell, 'The proliferation of markets'; Biddick, 'Medieval English peasants'.
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