Alliance of Four Great Races
Legacy of Alliance on Heliopolis
Political information
Type of government	Knowledge and information sharing
Societal information
Capital	Heliopolis Heliopolis II
Official language	Furling Ancient Asgard Nox Universal language
Historical information
Date of establishment	Over 10,000 years ago
Date of dissolution	Unknown

[Source]

"That's a pretty heady group."

—Jack O'Neill

The Alliance of Four Great Races was an intergalactic alliance composed of the most advanced races known at that time: the Ancients, the Asgard, the Furlings, and the Nox. They would periodically meet to discuss matters of mutual concern and importance. To ensure universal communication, they created a "universal language" composed of representations of the primary elements.

The Alliance appears to have dissolved after the last remaining Ancients disappeared, and while it is unknown if the other three races still interacted with each other on some level after their passing, it is likely. With the extinction of the Asgard, only the Nox, and perhaps the Furlings, remain. However, before their mass suicide, the Asgard proclaimed the Tau'ri as the Fifth Race of the Great Alliance. (SG1: "The Torment of Tantalus", "The Fifth Race", "Unending")