Genii Confederation

From The Stargate Omnipedia

A long dead coalition of planets in the Pegasus Galaxy. Millenia ago the Wraith successfully defeated the alliance, driving the Genii into underground bunkers on their homeworld.

It is possible the Manarians were once a part of the confederated planets, due to the partnership between the Genii and the Manarians today.

KEY EPISODE

Underground - Cowen explains the history of the Genii to Sheppard's team, mentioning that his people were once a great confederation of planets.