alli snow

So this is basically my understanding of the Ancients and the Replicators/Asurans, and their history, in both the Pegasus and Milky Way galaxies. It's backstory mainly pieced together from information from episodes along with Gateworld's very helpful Omnipedia. Unfortunately it's been a while since I've seen some episodes and that's why I'm putting this all out there, to see if I've missed anything or if anyone else has a different take.

This whole thing contains SGA spoilers through "First Strike", but the comments could contain more... who knows?

The Ancients started out in another galaxy where they in the Ori were effectively the same race. However, the Ori believed that they had a right to 'play God' over unenlightened mortals, and were willing to go to the war with the Ancients over this. But rather than let this happen, the Ancients left for the Milky Way, and while they were there they spent their time seeding human life - and Stargates - throughout the galaxy. They were able to repress the Ori's knowledge that the Milky Way was populated, at least for a time.

Atlantis may have been constructed on Earth, and at one point a second-generation Gate (the big turny stone kind) was placed on Earth as well as the one already present inside Atlantis.

But at some point "several million years ago" most of the Ancients left on Atlantis. This may have had something to do with the virus that Ayiana was carrying and exposed Jack and the others to (a plague in the ancient Milky Way galaxy has been mentioned in several SG-1 episodes, including Window of Opportunity and Threads). Maybe they just wanted a new galaxy to seed with life. At least one Ancient, later called Aiyana, was left behind in the vicinity of the Stargate (which, depending on how many millions of years ago this all happened, may not have been a icy wasteland it would become after the supercontinent broke up and Antarctica moved to the southern pole).

( Continued behind the cut )