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The Southern margins of the diocese of Evreux experienced specific dynamics throughout the 11th and 12th centuries, related to the defense of the state border of the Duchy of Normandy. This evolution was also linked to the intense demographic pressure as well as the economic growth experienced in the region over the same period. The urban phenomenon manifested itself through a gradual process of creation of rural towns, associated with the main castles along the border. The legal apparatus of burgess rights concerned not only the growth and monetization of the economy, but also agricultural development, which in turn contributed to the expansion of commercial exchange. Rural spaces around the rural towns of the Iton-Avre interfluve thus ended up constituting a series of specific micro-regions, clearly distinct from the inhabited areas. Some of these terroirs are still recognizable in today's landscape, and appear in the sources. Operating under its own set of customary rules, this economic model perpetuated itself even though it had rapidly reached its limit due to war and a general end to economic growth.