Timeline

This is not whole inclusive or calm 100% accuracy. Add you favourites stargate dates In the comments

Hundreds of millions of years ago The Ancients fled the ori and there home galaxy.

One hundred million years to seventy-five million years ago ancient made there frist settlements in the milkyway

Sixty million years to Fifty million years ago the ancient launched destiny

Ten to five million years ago the ancient plague started and the some ancients fled to pegasus and some ancient ascended. The rest died

100,000 years ago.

The record history of the asgard starts

The wraith are created (so Todd believes)

30000 years ago

The asgard began exploring other galaxies

Some time after this. the asgard made peaceful contact with the nox, ancient and furling

19000 years ago

A war between ra and anubis starts ending in anubis defeat and exile

Ra created the high council of the system lords and became the first supreme system lord

12500 years ago

Ra discovered earth and the Goa'uld started transitioning to human hosts.

Humans were taken from earth as slaves

11000 years ago

The record history of the gadmeer starts

(Wraith are created according to a book)

Harlan the Android beings his caretakering of his facility.

10100 years ago

War with the wraith start

10000 years ago

The Ancients fled Atlantis to return to earth where they ether ascended or mated with the locals and lived out there days

5000 years ago

A rebellion by humans expelled the Goa'uld from earth

2000 years ago

Destiny crew are trapped on Novus. Creating a new civilisation.

Tok'ra war with the Goa'uld being.

1000 years ago

The gadmeer civilisation was destroyed but they managed make and deploy the Gadmeer terraformer vessel so there civilisation could continue

Few thoughts .

The Ancients really deserves their name. (I always thought it was weird when the asgard called them the Ancients. But if the shoe fits)

The Asgard did really well to catch up in the time they had. Those beam weapon are Ancients grade weapons.

The Asgard made contact with the Ancients while they were in pegasus. (Meaning that the furling may also be in another galaxy)

The ancient would of know that the Goa'uld existed.

Was Harlan people human. 1500 years Seem like quick turn around to go from salves with stone tools too robots that can last eleven thousand years.