"We do not see that all Greece, or even a Greek city, formally asked for this right of citizenship, so much desired; but men worked individually to acquire it, and Rome bestowed it with a good grace.' Some obtained it through the favor of the emperor; others bought it. It was granted to those who had three children, or who served in certain divisions of the army. An easy and prompt means of acquiring it was to sell one's self as a slave to a Roman citizen, for the act of freeing him according to legal forms conferred the right of citizenship. One who had the title of Roman citizen no longer formed a part of his native city, either civilly or politically. He could continue to live there, but he was considered an alien, he was no longer subject to the laws of the city, he no longer obeyed its magistrates, no longer supported its pecuniary burdens. This was a consequence of the old principle, which did not permit a man to belong to two cities at the same time."