In Iceland in the year 536 ad there was a massive volcanic eruption. This historical period scientists call one of the worst and dedicated to him an article in the journal Science.
Historian Michael McCormick, working at Harvard University, argues that in this period Europe, the middle East and parts of Asia fell the fog. It has significantly reduced the amount of incoming sunlight, which caused significant cooling. Cultivation of crops became a problem, so people expect crop failures, resulting in hunger and disease. The most serious consequence was the outbreak of plague in 541, which resulted in the deaths of hundreds of millions of people.
The events described by the Byzantine historian Procopius of Caesarea. In his words it became clear that the sun's rays from entering the earth, since the sun shone like the moon. According to him, it was the emergence of hunger, disease and war. Scientists confirm that the disaster has a volcanic nature. This is confirmed by microscopic particles of volcanic glass that were found in the sediments of ice and have the appropriate age. Scientists confirm that a massive volcanic eruption in Iceland nearly led to the destruction of humanity.