I’ve continued to collect ancient literary sources about Isis. I have a set of working notes (in no particular order) here. There seems to be a lot of wild talk around about Isis too.
Today my objective was to discover the attitude of Augustus to the cult. I have read unreferenced claims that Augustus described the cult as “pornographic” — but have yet to find a source for this. But I did eventually locate the source that showed that he pushed the cult outside the pomerium, not in Tacitus, as several books claim, but in Cassius Dio.
But there is still a lot to do.