Ok, I know I'm not the first person to attempt this and I'll probably not be the last, but here's what I've managed to work out so far going by what we've seen from both the Episodes & Comic Series.

The Beginning.
Creation of The World.
Birth of the Three Pony Tribes.

Paleo-Pony Period
First recorded Outbreak of Cutie-Pox

Age of the Three Tribes.

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