[blam]

"The speculation is that it is a celestial event, comets, meteorites, asteroids or the like.

I think there was a big one around 1300 A.D.

Why? It doesn't show up in the tree rings. (maybe a small localized event?)

[#3Fan]

Why? It doesn't show up in the tree rings. (maybe a small localized event?)

Look here. It was a terrible century.