[blam]

"how about the others? Any more volcanoes ? "

The ice cores have recorded an acid layer (volcano) on all the dates listed except 540AD. Baily, Baillie, Clube and Napier think/suspect that 540AD was a comet/asteroid, the beginning of the Dark Ages.

[newcats]

the beginning of the Dark Ages.

The Dark Ages? What were those?
If you are talking about pre-renasaince (?) Europe, you have your dates all wrong.