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was a combination of legal and military customs in medieval Europe that flourished between the 9th and 15th centuries. Broadly defined, it was a way of structuring society around relationships derived from the holding of land in exchange for service or labour.

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Charlemagne is crowned emperor - December 25, 800. Pope Leo III crowned the Frankish king, Charlemagne, Emperor of the Romans on Christmas Day, 800 in St. Peter's Basilica in Rome, making him the most powerful ruler of his time. In November 799, Charlemagne (ca. 747 - 814) set out for Rome.

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The break of communion between what are now the Catholic Church and Eastern Orthodox churches, which had lasted until the 11th century.

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The pope asked Christians to take the holy land from Muslims which caused a holy war. The crusaders of the First Crusade managed to recapture the holy city of Jerusalem in 1099

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The Second Crusade was started in response to the fall of the County of Edessa in 1144 to the forces of Zengi.

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The Third Crusade was an attempt by some leaders of Western Christian states to reconquer the Holy Land following the capture of Jerusalem by the Ayyubid sultan, Saladin, in 1187.

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was one of the most devastating pandemics in human history , resulting in the deaths of an estimated 75 to 200 million people in Eurasia and peaking in Europe from 1347 to 1351.

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Signed on 15 June by King John of England in Runnymede, Surrey, Magna Carta was meant as a peace treaty between King John and his subjects, and demanded that every person had to obey the law, including the king.

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The Hundred Years' War was a series of conflicts waged from 1337 to 1453 by the House of Plantagenet, rulers of the Kingdom of England, against the French House of Valois, over the right to rule the Kingdom of France. Each side drew many allies into the war.

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The Tribunal of the Holy Office of the Inquisition, commonly known as the Spanish Inquisition, was established in 1478 by Catholic Monarchs Ferdinand II of Aragon and Isabella I of Castile.