FESA

The Fesa are an advanced alien species which developed space faring capacities some at some point between 1 and 10 million years ago and established themselves on Tschai, chasing the Gjee who had previsouly settled on the planet. They are said to have then fled the light of the red star Hsi (although it remains unclear what is meant by this assertion.)
Source: Jack Vance, Planet of Adventure, The Pnume