The Mandaean text Dmuth Kushta (“Image of Truth”) has only been published in booklet form by Majid Fandi al-Mubaraki in 2002, and isn’t even in the Drower collection. In it, there is a reference to a “king of the Nasoraeans”. This could be an important historical clue, perhaps comparable in value to the reference to Artapanus in the Haran Gawaita. Or it could simply reflect the use of “king” as a term for a “priest”.
The entire phrase in which this is found is tantalizing , but what if anything it tells us remains to be seen. And it will be a while before I manage to work through the whole text, much less make sense of it.