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Peter and Paul are executed: martyrdom of the church's two greatest apostles forces leadership into a new era.
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The earliest known public churches are built, signaling a shift in Christians' life and practice.
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Emperor Theodosius I made Nicene Christianity the state church of the Roman Empire with the Edict of Thessalonica
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Charlemagne crowned Holy Roman Emperor: With the help of his adviser, Alcuin, the seven- foot- tall king brings Europe political unity, a stronger church, and a renaissance.
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The East-West Schism; the Latin and Greek portions of the church permanently separated into the Roman Catholic Church and the Ester Orthodox Church.
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Pope Urban II launches the First Crusade. This is a way to liberate the Holy Land and Jerusalem from the Arab Caliphate.
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Innocent III call the Fourth Lateran Church Council, which climaxes the rule of the medieval church's most influential pope and defines transubstantiation.
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The Roman Catholic Church ends up with 3 popes at one time, and after it is settled it permanently begins the decline of the Roman Catholic Church power.
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Constantinople falls to the Turks, ending a millennium of Christianity in the Eastern Roman/ Byzantine Empire.
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Under Ferdinand and Isabell, begins against baptized Jews and Moors.
