Forests to Farmland - Drivers of the Age of Clearance in Medieval Europe

Between about 1050 and 1150 forests, heaths and marshes across western Europe gave way to fields, villages and monastic estates, the period French historians call les grands défrichements. Population growth, new tools, a warmer climate and ambitious lords are all named as causes. Which of these drivers does the evidence actually support?

People and lords
The basic driver was a growing population. Bioarchaeological research on England, based on seeds, animal bones and pollen, shows that cereal farming expanded over several centuries, with population growth concentrated between the tenth and thirteenth centuries [1]. That expansion went hand in hand with the growth of towns and markets, with rising inequality and with the rise of lordship [1]. Lords who let out new land gained rents and dues, which gave them every reason to encourage clearing.

Tools
Technology made heavy soils workable. The mouldboard plough, which could turn the wet clay soils common in northern Europe, spread after about 1000 [2]. Economists link it to roughly a tenth of the rise in population density and urbanisation in the High Middle Ages [2]. It was a contributing factor, not the whole explanation.

Climate
Europe was relatively warm in the early second millennium, and the period between 1000 and 1300 was warmer than that between 1500 and 1850 [3]. Climate modelling, however, suggests that the warmth was limited to Europe and mainly to the summer, and that the term Medieval Warm Period has little meaning on a hemispheric scale [3]. The same study points to a feedback: deforestation in Europe was especially intense between 1000 and 1250 and itself affected the climate [3]. A warmer climate helped, but it was not a simple cause.

Monks and military orders
Monasteries are often presented as pioneers. Twelfth century charters from the region of Narbonne show Cistercian houses acquiring land that was already cultivated, with tenants and leases, rather than taming wilderness [4]. The Templars and Hospitallers arrived later still. Their houses were mostly managers of donated estates, with mills, barns and markets, rather than clearers of forest; this is discussed in our post on the key players of the clearance [5].

The evidence suggests that the clearance of Europe was driven above all by population growth and lordship, helped by the heavy plough and a favourable European climate. Monks and military orders mostly reorganised and managed land that others had opened. The age of clearance was a long process with many actors, not the work of one group.

This blog is original work by TemplarsNow^TM based on an AI-assisted quick scan on the topic. References and further reading, Open Access if available, all links verified October 17, 2026 and all sources checked but not all studied in detail: [1] Hamerow, H., Bogaard, A., Charles, M. et al. (2025) Feeding Medieval England: A Long Agricultural Revolution, 700-1300, Oxford: Oxford University Press, open access (CC BY-NC-ND); [2] Andersen, T.B., Jensen, P.S. and Skovsgaard, C.S. (2016) The heavy plow and the agricultural revolution in Medieval Europe, Journal of Development Economics 118, pp. 133-149 (discussion paper version); [3] Goosse, H. et al. (2006) The origin of the European Medieval Warm Period, Climate of the Past 2, pp. 99-113, here pp. 99, 101-102, 105, 110; [4] Benson, D.R. (2024) From the Fruits of Tenant Labour: Agricultural Rents and Cistercian Leasing in the Region of Narbonne (Twelfth Century), Mutations en Méditerranée 2; [5] TemplarsNow (2025, rewritten 2026) Key Players in the Rural Clearance of Medieval Europe 1050-1150.

Illustration: Ploughing with oxen, Luttrell Psalter (c. 1325-1335), British Library Add MS 42130, via Wikimedia Commons (public domain).

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