It uses, as sources, Chaosium publications which are copyright to Chaosium, or the original authors. They are deliberately of the same power level as the Pendragon clan, in essence being the counterparts to Arthur in the east. Eventually, the clan should be fleshed out with sheets for Justinian and Theodora, although that might be excessive, since space is limited and they play no direct part in the stories.
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In the Arthurian legends, the Byzantine empire was a distant and mundane place, whose power was faint in comparison to Arthur's mystical and blessed kingdom. Both of these Byzantines were rather obscure. The Justinian Clan began with Justin the First, a Balkan peasant who arrived, illiterate, in Constantinople and worked his way to the Emporership through the army. He groomed his nephew, Justinian to succeed him. Justinian became the last of the great Roman Emporers.