Mike Franke wrote:
If you go far enough into the past the players actions can't really affect the timeline. They would be like a pebble thrown in a mighty river. They might make ripples but the river isn't changing course.
Golarions recorded history is like 10,000 years. Send the pcs back that far and you don't have to worry about anything they do.
Actually, the further back you go the bigger the ramifications would be. For example, If you went back and eliminated Genghis Khan as a child, half of the world's population wouldn't exist as he's a ancestor of a huge number of people.
Think of it like a tree, changing a branch only affects a few leaves, changing something way down in the trunk affects all of the leaves.