Volcanic eruptions tipped Europe into Dark Ages collapsed the Mayan empire and caused widespread famine in China. Mid 6th century volcanic eruptions plunged the planet into coldest climate in millenia.

See the source article by following the link below:Volcanic eruptions tipped Europe into Dark Ages, collapsed the Mayan empire and caused widespread famine in China. Mid 6th century volcanic eruptions plunged the planet into coldest climate in millenia.