High Middle Ages

• 1. Introduction

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  The High Middle Ages began around the year 1000, and in the three and a half centuries that followed, Europe transformed itself beyond recognition. A continent that had spent centuries contracting, losing population, losing trade, losing cities, suddenly reversed course. What drove that reversal? How did a relatively quiet corner of the world produce universities, Gothic cathedrals, the first experiments in parliamentary government, and a technological burst that one historian argued produced more inventions in a single century than the previous thousand years combined? Those are the questions this documentary will pursue.

• 2. A Warming World

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  From the 10th century to around the 14th century, Europe enjoyed what historians call the Medieval Warm Period. Farmers grew wheat well into Scandinavia. Wine grapes ripened in northern England. The warmth was not merely an agricultural footnote; it was the engine behind one of the most consequential demographic surges in European history.

  With fewer famines and steadier harvests, populations rose sharply. That growth fed itself: more people meant more labor, more land under cultivation, and more surplus to trade. New towns appeared. Trade routes filled. By 1350 the European economy had reached levels that, in some regions, would not be matched again until the 19th century.

  Farmers upgraded their tools as well. They switched from oxen to horses for plowing. They adopted a heavier plow suited to the dense northern soils. Most significantly, they moved from a two-field rotation system to a three-field system, which allowed a greater variety of crops, including legumes that restored nitrogen to the soil rather than exhausting it. That single agronomic shift helped feed millions of extra mouths.

  Historian Charles Higounet gave a name to the land-clearing campaigns of this era: the "great clearances." Across the continent, Europeans felled forests and drained marshes that had lain untouched since the fall of the Western Roman Empire. Settlers pushed beyond the Frankish Empire's old borders, past the Elbe River, tripling the size of Germany in the process. The warming centuries made all of this possible. What the Little Ice Age would later take back, cooling Europe until the middle of the 19th century, lay still in the future.

• 3. The Invention Machine

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  In less than a century during the 12th and 13th centuries, Europe adopted or invented more useful technologies than had appeared across the previous thousand years of human history worldwide. That claim comes from Alfred W. Crosby, who examined it in his book The Measure of Reality: Quantification in Western Europe, 1250-1600.

  The list of innovations from this period is striking in its range. Windmills appear in the documentary record by 1185, when the earliest written record places one in Yorkshire, England. Paper manufacture began in Italy around 1270. The magnetic compass reached Europe some time in the late 12th century. Eye glasses were invented in Italy in the late 1280s. Fibonacci introduced Hindu-Arabic numerals to European readers in his 1202 book Liber Abaci, a shift that made complex calculation far more practical. The spinning wheel arrived in Europe, probably from India, during the 13th century.

  Shipbuilding improved alongside navigation. The West's oldest known depiction of a stern-mounted rudder appears on church carvings dating to around 1180. That innovation, combined with the magnetic compass, gave sailors far more control over their vessels. Crosby and others have argued that these two advances together made possible the dawn of the Age of Discovery, the era of oceanic exploration that followed.

  The intellectual infrastructure for all of this was the university. The oldest university in continuous operation in the world appeared in the 11th century in Italy: the University of Bologna. Two more opened in the 12th century, the University of Paris and the University of Oxford. Cambridge followed in 1209, Salamanca in 1218. These institutions did not merely teach; they translated. Contact with the Islamic world in Spain and Sicily, and with the Byzantine world during the Crusades, gave European scholars access to Arabic and Greek scientific texts they had never seen. The works of Aristotle, Alhazen, and Averroes flowed into Latin, and the universities spread them.

• 4. The Scholastic Mind

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  Thomas Aquinas was later declared a "Doctor of the Church," and his elevation captures something important about the intellectual ambition of this period. Aquinas led the philosophical move away from the Platonic and Augustinian traditions and toward Aristotelianism. He developed a philosophy of mind, writing that the mind at birth was a tabula rasa, a "blank slate," that acquired the ability to think and recognize ideas through a divine spark.

  The movement Aquinas anchored was Scholasticism, a fusion of Judeo-Islamic and Catholic thought with ancient philosophy. Scholastics generally believed in empiricism. They held that Roman Catholic doctrines could be supported through secular study, reason, and logic. They opposed Christian mysticism and the idea that the mind is an immaterial substance. The approach had been pioneered by Anselm of Canterbury, who lived from 1033 to 1109, and fed through thinkers such as Maimonides, Ibn Sina, and Ibn Rushd before reaching the Latin West.

  Robert Grosseteste pointed toward something resembling the modern scientific method by insisting on mathematics as a way to understand nature. Roger Bacon pushed further with his empirical approach, developed at length in his Opus Majus. Albertus Magnus, who died in 1280, and Duns Scotus absorbed and extended the tradition. Opponents within the scholastic world, including William of Ockham and Bernard of Clairvaux, sharpened the debates without stopping the movement's momentum.

  This was not purely a Western Latin phenomenon. Byzantine scholarship remained productive throughout this period, even as the empire itself weakened. Michael Psellos, one of the most prominent philosophers of the 11th century, reinvigorated Neoplatonism on Christian foundations and bolstered the study of ancient philosophical texts. His successor at the University of Constantinople, Ioannes Italos, extended the Platonic line and drew criticism from the Church for opinions it considered heretical, including the doctrine of transmigration. Byzantine historical writing also flourished, with the brothers Niketas and Michael Choniates working in the early 13th century and George Akropolites a generation after them.

• 5. Faith, Crusade, and Dissent

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  In 1054, Pope Leo IX and Patriarch Michael I excommunicated each other. The immediate trigger was a dispute over the filioque, an addition to the creed concerning the origin of the Holy Spirit, combined with disagreements over papal authority, the use of unleavened bread in the liturgy, and fasting rules. The East-West Schism formally divided the Christian church into Roman Catholicism in the west and Eastern Orthodoxy in the east, a fracture that shaped European politics for centuries.

  Forty-two years later, the First Crusade launched, with papal authority behind armies crossing Europe toward the Holy Land. The Fatimids had captured Palestine in 970, lost it to the Seljuk Turks in 1073, recaptured it in 1098, and lost it again in 1099 as the First Crusade arrived. The crusaders founded states in the Levant that would persist until Acre, the last European outpost in the Near East, fell to the Mamluks under Khalil in 1291.

  The military orders that grew from the Crusades became powerful institutions. The Knights Templar, founded after the First Crusade to protect Christian pilgrims, grew deeply involved in banking before Philip the Fair had the entire order arrested in France in 1307 on charges of alleged heresy. The Teutonic Knights, formed in 1190 in the city of Acre, eventually moved to Transylvania in 1211 and later invaded pagan Prussia to Christianize the Baltic region. Their considerable power was broken at the Battle of Grunwald in 1410, where a joint Polish-Lithuanian army defeated them decisively, and the order declined until its official dissolution in 1809.

  Within Western Christendom, dissent was growing alongside the cities. Peter Waldo of Lyon was a wealthy merchant who gave up his wealth around 1175 after a religious experience and began preaching. He founded the Waldensians, who insisted that all religious practice must have strictly scriptural bases. The Third Lateran Council denied him the right to preach in 1179; he ignored the ruling and was excommunicated in 1184. Waldo rejected the selling of indulgences and criticized the clergy for not living according to the word. Centuries later, the Waldensians melted into Protestantism when the views of John Calvin and his successors in Geneva proved remarkably similar to their own. Waldensian churches still exist on several continents.

  The Cathars, whose name derives from the Greek word for "pure," emerged as an even larger challenge. Catharism originated around the middle of the 10th century in Languedoc and surrounding areas of southern France. One of the first recorded uses of the name appears in a text by Eckbert von Schönau, who wrote in 1181 about heretics from Cologne. The Catholic Church's response to the Cathars was one of elimination, culminating in the Albigensian Crusade, which ran from 1209 to 1229.

• 6. Stone, Sound, and Story

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  Gothic architecture changed the visual language of the Christian world. It combined flying buttresses, pointed arches, and ribbed vaults into buildings that appeared to reach upward toward the sky rather than pressing down into the earth. The effect was intentional: thin horizontal lines and glass panels flooded interiors with light, and light was commonly understood as an expression of God. Notre Dame de Paris became the most famous example of this approach, and according to art historian Erwin Panofsky's Gothic Architecture and Scholasticism, even the floor plan followed the divisions and uniform subsections characteristic of scholastic thought.

  Music evolved in parallel. Early in the period, Gregorian chant dominated church music. During the 11th century, Guido of Arezzo was among the first to develop musical notation, making it easier for singers to learn and remember the chants. During the 12th and 13th centuries, Gregorian plainchant gave birth to polyphony through the French Notre Dame School, particularly in the works of Leonin and Perotin. An important composer during the 12th century was the nun Hildegard of Bingen. Secular music grew alongside the sacred, carried by the troubadours who arose in Occitania in the late 11th century. They came from all classes of society, traveled widely, and wrote on many subjects, with particular attention to courtly love. Their style spread to the trouveres of northern France, the minnesingers of Germany, and the secular composers of the Trecento in northern Italy. Provençal literature also reached Sicily and laid the groundwork for the "sweet new style" of Dante and later Petrarca.

  Theatre found new homes in the guilds. Trade guilds performed plays, usually drawing on biblical stories connected to their profession: a baker's guild might stage a reenactment of the Last Supper. In the British Isles alone, plays were produced in some 127 different towns during the Middle Ages. The surviving play cycles from this era are substantial: York produced 48 plays, Wakefield 32, Chester 24. The earliest known secular play from this tradition is The Play of the Greenwood by Adam de la Halle, performed in 1276, which combined satirical scenes with folk material including faeries and supernatural events.

• 7. A World Connected

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  In the late 13th century, a Venetian explorer named Marco Polo became one of the first Europeans to travel the Silk Road to China, documenting the journey in Il Milione. He was followed by a series of Christian missionaries and travelers to the East, among them William of Rubruck, Giovanni da Pian del Carpine, Andre de Longjumeau, Odoric of Pordenone, Giovanni de' Marignolli, and Giovanni di Monte Corvino.

  Closer to home, the Hanseatic League built a commercial network that knit northern Europe together. Founded in the 12th century with the establishment of Lubeck in 1158-1159, the League drew in cities across the Holy Roman Empire, including Amsterdam, Cologne, Bremen, Hanover, and Berlin. Outside the Empire, it reached Bruges, the Polish city of Gdansk, and Konigsberg, the capital of the Teutonic Knights' monastic state. In Bergen, Norway and Veliky Novgorod in Russia, the League maintained factories and middlemen.

  The Italian maritime city-states moved goods across the Mediterranean. Pisa, Amalfi, Genoa, and Venice all grew wealthy on Eastern Mediterranean trade and became major financial centers in the process. Their prosperity was not independent of the wider transformations around them; it fed on the same population growth, the same agricultural surplus, and the same institutional innovations that were remaking the continent.

  By 1350, however, the momentum was reversing. The famine of 1315 had already killed around one and a half million people. The crisis of the late Middle Ages was gathering: regional wars, economic stagnation, and above all the Black Death. The robust population increase that had lifted European economies to levels not seen again in some areas until the 19th century was about to be cut violently short. The High Middle Ages had built something extraordinary. What came next would test how much of it could survive.