Lanteans
From The Stargate Omnipedia
The Ancients who originally inhabited the city of Atlantis. The name is likely an abbreviation of "Atlanteans," and may be Pegasus Galaxy slang. The term is used by the Wraith, among others.
See also: Ancients
DETAILS
HOMEWORLD - Lantea
FIRST APPEARED - Before I Sleep
KEY EPISODES
The Defiant One - A Wraith commander recognizes a Puddle Jumper to be Lantean technology, but believes that his race defeated the people long ago.
Before I Sleep - Dr. Weir travels 10,000 years into the past and meets Atlantis's last inhabitants, who submerge the city and gate to Earth.
The Return, Part 1 - The team finds an Ancient warship travelling home, and helps them return to Atlantis -- only to see them expel the team from Earth from their adopted home.