The 1340s was a decade that began on 1 January 1340 and ended on 31 December 1349. It was in the midst of a period in human history often referred to as the Late Middle Ages in the Old World and the pre-Columbian era in the New World.
In Asia, the Mongol Empire and its breakaway states were in a state of gradual decline. The Ilkhanate had already fragmented into several political territories and factions struggling to place their puppet leaders over the shell of an old state; the Chagatai Khanate was undermined by religious unrest and fell to rebellion. The Black Plague swept through the Kipchak Khanate in 1346, and also affected the Genoese colonies under Mongol siege, thence spreading into Europe. The Yuan dynasty in China was struck by a series of disasters, including frequent flooding, widespread banditry, fires in urban areas, declining grain harvest, increased civil unrest and local rebellion – the seeds of resistance that would lead to its downfall. Southeast Asia remained free from Mongol power; two major regional powers, the Tran dynasty and Majapahit thrived in the 1340s, after each defeated Mongol attacks in the 1280s and 1290s respectively.
In Europe, the decade continued the period of gradual economic decline, often mistitled the "depression" of the 1340s. This followed the end of the Medieval Warm Period and the start of the Little Ice Age in the 14th century, and affected most of Western Europe, with the exception of a few Italian city-states. The state increasingly interfered in the socio-economic status of its commoners in the decade. Europe entered a period which saw almost continuous war for the next century. The Hundred Years' War (1337–1453) between France and England continued, and Edward III of England led an invasion resulting in notable victories at the Battles of Sluys and Crécy in 1340 and 1346 respectively. The medieval crusading spirit continued in Spain, with a Castilian victory at the Battle of Río Salado and the recommencement of the Reconquista in 1340; and in the Baltic, with Swedish King Magnus Eriksson's Northern Crusades against Novgorod in 1347–1348. In the east, the Byzantine Empire, then under the Palaiologoi, saw the disastrous Byzantine civil war of 1341–1347. Meanwhile, a crisis of confidence in the Florentine banks caused many of them to collapse between 1341 and 1346. The Black Plague which struck Europe in 1348 wiped out a full third of the population by the end of the decade.
In Africa, the two great empires were the Christian Ethiopian Empire in the east and the Muslim Mali Empire in the west. Amda Seyon I, who had brought Ethiopia to its height, was succeeded in 1344 by Newaya Krestos, who continued to foster trade in East Africa. Mansa Suleyman assumed office in the Mali Empire in 1341, and similarly took steep measures to reform Mali's finances. Songhai, which had emerged in this decade, was conquered by Mali for the time being. In the Americas, cities of the Mississippian culture such as Cahokia, Kincaid and Moundville went into an accelerated state of decline in this decade. Factors such as depletion of resources, climatic change, war, disease, social unrest and declining political and economic power have been suggested, although the sites were not fully abandoned until the 15th century. Central America saw the decayed Maya civilization ruled from their capital Mayapan in the Yucatán Peninsula, while the Mexicas from their capital city of Tenochtitlan were on the rise.
Political leaders
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File:Alfonso XI, king of Leon and Castile 02.jpg| Alfonso XI of Castile
File:Edward III of England head.png| Edward III of England
File:Clemens VI.png| Pope Clement VI
File:Phil6france.jpg| Philip VI of France
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Asia
Political developments
Mongol decline
thumb|right|The political configuration of Asia in the mid-1340sIn the Kipchak Khanate, Özbeg Khan of the Golden Horde died in 1341, ending what Muslim chroniclers considered a golden age. His elder son Tinibeg ruled for a year or two, before being dethroned and killed at the hands of his younger brother Janibeg in 1342. Janibeg's fifteen-year reign was notable for the appearance and rapid transmission of the Black Plague along the trade routes from inner Asia in this decade. The eastern half of Chagatai seceded under the conservative Mongol element when Tughluk Temür seized power in Moghulistan around 1345.
In the Persian Ilkhanate, the Mongol House of Hülegü had been extinguished in the male line with the death of Il-Khan Abu Sa'id in 1335, . As JJ Saunders wrote, "A crowd of competitors for the vacant throne started up, but of some history has scarcely condescended to record their names, much less their actions, and an interval of more than thirty years was filled with confused political struggles"<!--(until the emergence of Tamerlane in 1369)-->. Numerous claimants were set up in the 1330s; by 1339, the two rivals were Jahan Temür set up by Shaik Hasan-i Buzurg, and Suleiman Khan supported by Shaik Hasan-i Kuchak. In June 1340, the two Hasans and their rival khans met in battle on the Jaghatu; "Hasan-i Buzurg was defeated and fled to Baghdad, where he deposed Jahan-Temür and himself assumed sovereignty as the founder of the Jalayir dynasty". "So insignificant had these figureheads become", according to JA Boyle, "that we are not even informed as to the time and manner of their death". Suleiman was replaced as puppet by Anushirvan, "in whose name his Chobanid masters continued to strike coin until 1353". Shaik Hasan-i Kuchak passed off a Turkish slave as his long deceased father Temür-Tash, as a pretence to attract the supporters of the Chobanids as well as the Oirat tribesmen who had fought under Musa.
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China
thumb|left|Flooding of the [[Yellow River posed a serious problem for the Yuan administration, effecting a recentralisation and regulation of power by the end of the decade]]
In China, the Mongol Yuan dynasty was in a gradual state of decline, due to complex and longstanding problems such as the "endemic tensions among its ruling elites". Toghon Temür had been installed as emperor at age thirteen in 1333, and was to reign as the last Yuan emperor until 1368. In Bayan's overthrow by the younger generation, the movement to restore the status quo from reign of Kublai Khan effectively died. Bayan's purges were called off; his supporters dismissed; positions he had closed to the Chinese were reopened; the meritocratic system of examinations for official service was restored. By this time, Temür had just begun to participate in the formal functions of state, and assisted in the "anti-Bayan coup": he issued a posthumous denunciation of his uncle Tugh Temür; he exiled the grand empress dowager Budashiri and his cousin El Tegüs; and entrusted the upbringing of his infant son Ayushiridara to Toghto's household.
Toghto's first term exhibited a fresh new spirit which took a predominantly centralist approach to political solutions.
Toghto's replacement as chancellor was Berke Bukha, an effective provincial administrator who took the opposite, decentralised approach to Toghto. Bukha had learned firsthand from the great Hangzhou fire of 1341 that central regulations had to be violated to provide immediate and effective relief. From 1348 on, they continued only when permitted by a major piratical operation led by Fang Kuo-chen and his brothers, which the authorities were unable to suppress. Additionally, the Yellow River was repeatedly swelled by long rains, breaching its dykes and flooding the surrounding areas. He was received in an audience with Toghon Temür, to whom he presented some large European horses — their bulk, according to JJ Saunders, "surprised Chinese and Mongols alike, accustomed as they were to the small, wiry animals of the steppes".
Military technology
- The poet Zhang Xian wrote the Iron Cannon Affair in 1341, detailing the destructive use of gunpowder and the cannon.
Europe
Political developments
War and decline in Western Europe
left|thumb|A [[Noble (English coin)|gold noble of Edward III; his arms show his claim to both France and England]]
In Europe, the decade continued the period of gradual economic decline, which followed the end of the Medieval Warm Period and the start of the Little Ice Age in the 1300s. This secular decline, often mistitled a "depression", affected most of Western Europe, with the exception of a few Italian city-states. Meanwhile, the role of the Parliament of England became more defined, with the House of Commons regularly petitioning Edward from about 1343 onward.
thumb|right|The [[Battle of Crecy in 1346 was the first great land battle of the Hundred Years' War. In the 1340s, Europe entered a century of virtually continuous war.]]
Europe entered a period which saw almost continuous war for the next century. The Hundred Years' War (1337–1453) between France and England continued, and Edward III led an invasion resulting in a number of victories. One of the earlier English victories was at the naval Battle of Sluys in 1340, which annihilated the French fleet and gave the English control of the English Channel for several years. The initial campaigns were frustrating and expensive, so Edward altered his strategy to use English armies that were lightly supported but prepared to forage off the land. Importantly, the English campaign of the 1340s "brought the hegemony of high medieval France to a decisive close." Pope Clement VI influenced the German Prince-electors to elect Charles of Moravia as rival king to Ludwig. The code defined two categories of people: the unfree, who came under peasant law (Gebauersrecht) and were consigned to the jurisdiction of their lords; and the freedmen. Such treatment shocked contemporary commentators such as Saint Bridget of Sweden. In the Danish crusader state of Estonia, some 80% of the indigenous population was subject to immigrant lords, to whom they owed tithe and military duty. When the lords reacted to falling grain-prices by increasing the level of tithe, which led to the St. George's Night Uprising in 1343. Beset by pressing problems at home and unable to break the monopoly of the Hanseatic League at sea, Valdemar decided to sell the territory to the master of the Teutonic Order for 10,000 marks. Her primary aim was to reform and purify the upper class, and her posthumously complied Revelations contain thoughts on the Northern Crusades which must have been expressed in the 1344–1348 period. Envoys were sent to the Russians in 1347, and an army was assembled that included Danish and German auxiliaries, and the support of Henry of Rendsburg. The army set sail for the campaign in 1348. The city was divided between competing boyar factions, and the lack of unity between Novgorod and her allies allowed for the success of Magnus' campaign of 1348. Pskov officially broke away from Novgorod that year; and Simeon was again delayed in helping against the Swedes, this time by business with his overlord, the Khan of the Golden Horde. Orekhov was taken by the Swedes, although it was to fall in 1349.
- Guy de Lusignan becomes King Gosdantin II of Armenia (1342)
- The Patriarchate of Antioch is transferred to Damascus under Ignatius II (1342)
- Serbian expansion
- In 1342, Louis I became King of Hungary.
Southern Europe
In Rome, the general despair brought on by the Plague and the absence of the Pope have been cited as possible causes for the rise of the Roman notary Cola di Rienzo: in 1347, he assumed the title of censor and claimed to restore the Roman Republic. He utilised popular rhetoric, and invited the men of Trastevere to sack the palaces of the fleeing Roman nobility. Castile and León surrounded Granada by land, and Alfonso advanced the Christian Reconquista.
By 1343, Aragon had acquired the Balearic Islands, and in 1344 Peter deposed James III of Majorca to become King of Majorca himself. Navarre was ruled by Philip III until 1343, his Capetian wife Joanna II until 1349, and finally Charles II the Bad ruled into the late 14th century. The Kingdom of Portugal was meanwhile ruled by Afonso IV, from 1325 until his death in 1357.
In 1341, Saluzzo sacked by Manfred V of Saluzzo. In 1342, Louis "the Child" became King of Sicily and Duke of Athens. An earthquake and tsunami of 1343 devastated the Maritime Republic of Amalfi.
Society and economy
Economic collapse and crisis
To finance the continuing wars of the 1340s, Edward III of England granted to a small group of merchants a monopoly on the export of wool. In return, they agreed to collect the "poundage", or wool tax, on his behalf. Therefore, a monopoly on salt, an essential commodity, was established in 1341; monopolies in salt had already been established in Kingdom of Castile and Venice in the 1330s. The French salt tax or gabelle itself never amounted to more than 2%.
The Italian city states were booming at the start of the decade. In 1340, Francesco Balducci Pegolotti wrote his Practica della mercatura. Meanwhile, rulers such as the Neapolitan princes had begun withdrawing massive funds from Florentine banks. and between 1341 and 1346, many of the most important of the Florentine banks collapsed. Strikes or grèves occurred in Ghent in 1337–1345 and in Florence in 1346. In 1349–1350, the fullers and weavers of Ghent and Liège massacred each other. The failures in the food supply in the regions of Provence and Lyon, in 1340 and 1348 respectively, affected contemporaries particularly harshly. This was not just because these generations were unused to them, but because they were accompanied by war and followed by epidemic in this decade. It was actually three related diseases: bubonic plague and septicaemic plague, carried by fleas hosted by the black rat, and pneumonic plague, the especially fast and lethal airborne variant. Hungary, Rouergue in France, and by January 1348 it was in Genoa. According to the French monk Guillaume de Nangis:
