The Hajas clan was one of the great families of the planet Kostroma.

Based on research by Adele Mundy, the clan started with Emilius Hajas, a rigger on a secondary colonization from Topaz, under the Princess Cecile Alpen-Morshach. He had a series of disciplinary charges pending and apparently deserted on Kostroma around 3902 CE.

The traditional history had one Simone Hajas saving Captain Wang from a mutiny, as well as Emilius Hajas being Commander of the Royal Bodyguard for Princess Cecile.1:2

One of its leaders, Walter Hajas, overthrew Elector Jonathan Ignatius and replaced him as Walter III.1:1