14 But you say, “How could they who were in captivity pass sentence of death?” asserting, I know not on what grounds, that Susanna was the wife of a king, because of the name Joakim. The answer is, that it is no uncommon thing, when great nations become subject, that the king should allow the captives to use their own laws and courts of justice. Now, for instance, that the Romans rule, and the Jews pay the half-shekel to them, how great power by the concession of Cæsar the ethnarch has; so that we, who have had experience of it, know that he differs in little from a true king! Private trials are held according to the law, and some are condemned to death. And though there is not full licence for this, still it is not done without the knowledge of the ruler, as we learned and were convinced of when we spent much time in the country of that people. And yet the Romans only take account of two tribes, while at that time besides Judah there were the ten tribes of Israel. Probably the Assyrians contented themselves with holding them in subjection, and conceded to them their own judicial processes.
Source: Origen to Africanus (New Advent)