In this year the Persians caused no further trouble for the Ionians, and at this same time certain things happened which greatly benefited the Ionians. Artaphrenes governor of Sardis summoned ambassadors from the cities and compelled the Ionians to make agreements among themselves that they would abide by the law and not rob and plunder each other. He compelled them to do this, and he measured their lands by parasangs, which is the Persian name for a distance of thirty stadia, and ordered that each people should according to this measurement pay a tribute which has remained fixed as assessed by Artaphrenes ever since that time up to this day; the sum appointed was about the same as that which they had rendered before. This then kept them peaceable.