Herod and the Herodians
Antipater to Antipas. The Idumaeans were a tribe who had been forced by the Nabatean Arabs westwards into southern Judea, where they had been forcibly converted to Judaism by the Hasmonean rulers of Israel. The Idumaeans were for this reason Jews of a recent and suspect background. At the same time they were shrewd, and had no scruples about making political deals with the Romans for their own advantage. Bible History Online.