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Oct 15, 1134
Gothic architecture created
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Mar 15, 1140
the church at Vezelay was built with a rib vault
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Apr 14, 1189
In 1189, the Frankish and English factions of the Third Crusade met at Vézelay before officially departing for the Holy Land.
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Aug 8, 1190
The Third Crusade started (with Byzantine Empire as one of the Christian opponents)
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Dec 13, 1395
The Byzantine Empire claimed to have sovereignty against the Russia
This was in a letter from Anthony IV, patriarch of Constantinople, to Basil I of Moscow -
Russia became Soviet Union
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Lenin becomes Chairman of the Council of People's Commissars of the Soviet Union