The Imperial cult tolerated and later included specific forms of pluralistic monism. For Imperial cult apologists, monotheists had no rational grounds for refusal, but imposition of cult was counter-productive. Jews presented a special case. Long before the civil war, Judaism had been tolerated in Rome by diplomatic treaty with Graeco-Judaean rulers. It was brought to prominence and scrutiny after Judaea's enrollment as a client kingdom in 63 BC. The following Jewish diaspora helped disperse early "Judaic" Christianity. Early Christians appear to have been regarded as a sub-sect of Judaism and as such were sporadically tolerated.