Were the Dark Ages Triggered by Volcano

Were the Dark Ages Triggered by Volcano-Related Climate Changes in the 6th Century?

(If so, was Krakatau volcano the culprit?)
by Ken Wohletz
Los Alamos National Laboratory
LA-UR 00-4608
Copyright  2000 UC

Modern history has its origins in the tumultuous 6th and 7th centuries. During this period agricultural failures and the emergence of the plague contributed to: (1) the demise of ancient super cities, old Persia, Indonesian civilizations, the Nasca culture of South America, and southern Arabian civilizations; (2) the schism of the Roman Empire with the conception of many nation states and the re-birth of a united China; and (3) the origin and spread of Islam while Arian Christianity disappeared. In his book, Catastrophe An Investigation into the Origins of the Modern World, author David Keys explores history and archaeology to link all of these human upheavals to climate destabilization brought on by a natural catastrophe, with strong evidence from tree-ring and ice-core data that it occurred in 535 AD.

via Were the Dark Ages Triggered by Volcano.