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In the 1200's the mongolian army were filled with the disease then further through time they were attacking the west in 1330. -
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after about 17 years the black death spread around big parts of turkey, Istanbul, which was the worlds most major trading destination, and all the merchants took it with them and spread it all over Europe -
A ship of soldiers that had come back to Europe had notified the nobles that their has been a disease that is being spread all over the countries