Lantean

The Lanteans, also known as the Ancestors, were those Ancients who left Earth in the City-ship Atlantis and settled in the Pegasus galaxy. They were directly responsible for the emergence of the Asurans and the Wraith.

Generally, the term "Lantean" is used to describe Alterans who inhabited Atlantis; though it can also refer to any Ancient who lived in the Pegasus galaxy at the time of Atlantis.