Gith

Gith  is the leader of the thrall rebellion that toppled the illithid empire thousands of years in the past, and founder of the githyanki and githzerai races.

History
Gith was a native of the planet Pharagos, which was part of the vast lithid empire, although she later led her followers to the Astral Plane after defeating their illithid masters.

Gith is said to have gone to the Nine Hells to serve Tiamat, the queen of evil dragons, as part of a pact between the githyanki and red dragons which was brokered by her advisor, Vlaakith.

After this pact was made, the red dragon consort of Tiamat, Ephelomon, went to Gith's followers to tell them of her sacrifice and convey Gith's final decree, making Vlaakith the first queen of all the githyanki and ordering them to continue their conquests.

Creative origins
Gith was created by Charles Stross for his Advanced Dungeons & Dragons campaign. She was first mentioned in the 1981 Fiend Folio.