A decade of freezing winters, failed harvests, deadly disease outbreaks, and economic collapse struck medieval England during the 1430s, according to new research that argues the crisis permanently reshaped English society and landholding.
The study, by Mark Bailey of the University of East Anglia, offers the first national survey of the extreme weather conditions that hit England in the 1430s and examines how the resulting economic turmoil transformed the medieval countryside. Published in The Economic History Review, the research links the decade’s severe climate conditions to the beginning of the “Great Slump,” a prolonged economic depression that lasted into the mid-fifteenth century.
Historians have long known that Europe experienced colder conditions during the fifteenth century, but Bailey’s research draws together evidence from climate science, manorial records, and economic data to show just how disruptive the decade proved for England.
England Faces a Climate Crisis
Detail of a bas-de-page scene of peasants slaughtering a pig and working in a snowy landscape, – British Library Add MS 35313, f. 7r
The 1430s brought some of the coldest winters of the fifteenth century. Scientific reconstructions indicate that winters in 1431–32, 1432–33, 1434–35, and 1436–37 were exceptionally severe, with rivers and lakes freezing across parts of Europe. Medieval chroniclers recorded long frosts in England and Ireland, while new climate models suggest the weather was also becoming wetter, bringing flooding and storms.
The effects were devastating for agriculture. Shortened growing seasons reduced harvest yields, while heavy rainfall in the later 1430s damaged crops across much of England. Bailey notes that the years 1437, 1438, and 1439 saw especially poor harvests, leading to soaring grain prices and widespread shortages.
“There was certainly dearth in England,” Bailey writes, “for example, the Stow chronicler commented that grain was so scarce in 1439 in the north that the poor made bread out of fern roots. Grain shortages were felt most acutely in towns, forcing the authorities in London to seek supplies from as far away as Lincolnshire, Denmark, and Prussia. In 1438 rioters at Ipswich and Southwold (Suffolk) confronted local merchants attempting to supply distant markets with grain. At various times between late 1437 and early 1439, the English Crown banned the export of grain from specific ports and dispatched royal justices across the realm to clamp down on profiteering from the sale of foodstuffs, and especially the staples of bread and ale.”
Wheat prices reached extraordinary levels. According to the study, prices in 1438–39 climbed to three times their normal level — the highest recorded during the entire fifteenth century.
The extreme weather also affected animals. Sheep suffered repeated outbreaks of disease, with mortality rates far above normal levels. Wool production collapsed on some estates, while rabbits, which were commercially raised in medieval England for both meat and fur, proved especially vulnerable to the cold and wet conditions.
The crisis extended far beyond farming. Ports, fisheries, bridges, and trade networks all suffered disruption. Wool exports from London nearly halved between the 1420s and 1430s, while cloth exports from Boston in Lincolnshire also sharply declined. Some rivers froze during the harsh winters, making navigation difficult and interfering with trade.
Disease compounded the misery. The study identifies repeated outbreaks of plague and other epidemics during the decade, especially in towns such as Norwich, London, and St Albans. One especially severe outbreak struck in 1438–39 following years of poor harvests and rising food prices.
Yet Bailey stresses that the impact of the crisis varied across England. Some communities were hit much harder than others, while certain textile-producing regions may even have benefited from increased demand for warm clothing during the colder weather.
A Decade that Changed Medieval England
Medieval farm depicted in British Library MS Burney 272 f. 34v
The study argues that the decade marked a major turning point in medieval English economic history. The economic downturn that began in the 1430s evolved into a long-lasting depression known as the Great Slump, characterized by weak trade, low prices, and a deeply depressed land market.
One of the most important consequences was a transformation in landholding practices. During the Middle Ages, much land in England was held under customary or “unfree” tenure, where peasants owed rents or labour services to landlords. Bailey argues that the economic crisis of the 1430s undermined this traditional system.
As conditions worsened, many tenants abandoned holdings that no longer seemed worth maintaining. Landlords struggled to find replacements and increasingly adapted by offering more secure and attractive forms of tenure. Over the following decades, hereditary and life tenures became more common, labour services declined, and landlords increasingly issued written copies of land agreements.
These changes helped give rise to what became known as copyhold tenure. Under this system, peasants held land according to the customs of the manor, with their rights recorded in manorial court rolls and confirmed through written copies given to tenants. Compared to older forms of customary tenure, copyhold generally offered greater security and more predictable obligations.
The research forms part of a growing field examining how climate shaped medieval history. Recent advances in climate science — including the analysis of tree rings, ice cores, and other environmental data — are giving historians new tools to study how weather affected past societies. Bailey’s work demonstrates how environmental shocks could reshape not just harvests and prices, but also institutions, landholding systems, and the long-term development of medieval society.
The article, “Extreme weather and economic crisis in the 1430s in England, and the implications for tenurial change,” by Mark Bailey, appears in The Economic History Review. Click here to read it.
Top Image: Bibliothèque nationale de France MS Français 1537, fol. 18v
A decade of freezing winters, failed harvests, deadly disease outbreaks, and economic collapse struck medieval England during the 1430s, according to new research that argues the crisis permanently reshaped English society and landholding.
The study, by Mark Bailey of the University of East Anglia, offers the first national survey of the extreme weather conditions that hit England in the 1430s and examines how the resulting economic turmoil transformed the medieval countryside. Published in The Economic History Review, the research links the decade’s severe climate conditions to the beginning of the “Great Slump,” a prolonged economic depression that lasted into the mid-fifteenth century.
Historians have long known that Europe experienced colder conditions during the fifteenth century, but Bailey’s research draws together evidence from climate science, manorial records, and economic data to show just how disruptive the decade proved for England.
England Faces a Climate Crisis
The 1430s brought some of the coldest winters of the fifteenth century. Scientific reconstructions indicate that winters in 1431–32, 1432–33, 1434–35, and 1436–37 were exceptionally severe, with rivers and lakes freezing across parts of Europe. Medieval chroniclers recorded long frosts in England and Ireland, while new climate models suggest the weather was also becoming wetter, bringing flooding and storms.
The effects were devastating for agriculture. Shortened growing seasons reduced harvest yields, while heavy rainfall in the later 1430s damaged crops across much of England. Bailey notes that the years 1437, 1438, and 1439 saw especially poor harvests, leading to soaring grain prices and widespread shortages.
“There was certainly dearth in England,” Bailey writes, “for example, the Stow chronicler commented that grain was so scarce in 1439 in the north that the poor made bread out of fern roots. Grain shortages were felt most acutely in towns, forcing the authorities in London to seek supplies from as far away as Lincolnshire, Denmark, and Prussia. In 1438 rioters at Ipswich and Southwold (Suffolk) confronted local merchants attempting to supply distant markets with grain. At various times between late 1437 and early 1439, the English Crown banned the export of grain from specific ports and dispatched royal justices across the realm to clamp down on profiteering from the sale of foodstuffs, and especially the staples of bread and ale.”
Wheat prices reached extraordinary levels. According to the study, prices in 1438–39 climbed to three times their normal level — the highest recorded during the entire fifteenth century.
The extreme weather also affected animals. Sheep suffered repeated outbreaks of disease, with mortality rates far above normal levels. Wool production collapsed on some estates, while rabbits, which were commercially raised in medieval England for both meat and fur, proved especially vulnerable to the cold and wet conditions.
The crisis extended far beyond farming. Ports, fisheries, bridges, and trade networks all suffered disruption. Wool exports from London nearly halved between the 1420s and 1430s, while cloth exports from Boston in Lincolnshire also sharply declined. Some rivers froze during the harsh winters, making navigation difficult and interfering with trade.
Disease compounded the misery. The study identifies repeated outbreaks of plague and other epidemics during the decade, especially in towns such as Norwich, London, and St Albans. One especially severe outbreak struck in 1438–39 following years of poor harvests and rising food prices.
Yet Bailey stresses that the impact of the crisis varied across England. Some communities were hit much harder than others, while certain textile-producing regions may even have benefited from increased demand for warm clothing during the colder weather.
A Decade that Changed Medieval England
The study argues that the decade marked a major turning point in medieval English economic history. The economic downturn that began in the 1430s evolved into a long-lasting depression known as the Great Slump, characterized by weak trade, low prices, and a deeply depressed land market.
One of the most important consequences was a transformation in landholding practices. During the Middle Ages, much land in England was held under customary or “unfree” tenure, where peasants owed rents or labour services to landlords. Bailey argues that the economic crisis of the 1430s undermined this traditional system.
As conditions worsened, many tenants abandoned holdings that no longer seemed worth maintaining. Landlords struggled to find replacements and increasingly adapted by offering more secure and attractive forms of tenure. Over the following decades, hereditary and life tenures became more common, labour services declined, and landlords increasingly issued written copies of land agreements.
These changes helped give rise to what became known as copyhold tenure. Under this system, peasants held land according to the customs of the manor, with their rights recorded in manorial court rolls and confirmed through written copies given to tenants. Compared to older forms of customary tenure, copyhold generally offered greater security and more predictable obligations.
The research forms part of a growing field examining how climate shaped medieval history. Recent advances in climate science — including the analysis of tree rings, ice cores, and other environmental data — are giving historians new tools to study how weather affected past societies. Bailey’s work demonstrates how environmental shocks could reshape not just harvests and prices, but also institutions, landholding systems, and the long-term development of medieval society.
The article, “Extreme weather and economic crisis in the 1430s in England, and the implications for tenurial change,” by Mark Bailey, appears in The Economic History Review. Click here to read it.
Top Image: Bibliothèque nationale de France MS Français 1537, fol. 18v
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