system
Given the following post, respond as if you're commenting on Reddit:
human
[Stargate] When did the Ancients die?

In Stargate SG1 they say the Ancients died from a virus and ascended millions of years ago, but in Stargate Atlantis they say the city was abandoned thousands of years ago.
When did they actually die?
gpt
Most of the Ancients did die or ascend millions of years ago after getting hit with an Ori plague.

The Atlanteans fled the Milky Way instead of dying or ascending, and survived as normal sacks of meat and blood for the Asurans and Wraith (respectively) to antagonize.  They eventually lost to the Wraith, and fled back to Earth, thinking that the plague must have finally been solved over the course of a million years.

The few Ancients left who made it back either lived lives with the primitive humans, or finally ascended.