Physically, the Great Nobles and their lesser subjects were quite similar. They were, like the commander and his men, human in every sense of the word. That this argues some ancient, prehistoric migration across the empty gulfs that separate the worlds cannot be denied, but when and how that migration took place are data lost in the mists of time. However it may have happened, the fact remains that these people _were_ human. As someone observed in one of the reports written up by one of the officers: "They could pass for Indians, except their skins are of a decidedly redder hue." The race of the Great Nobles held their conquered subjects in check by the exercise of two powerful forces: religion and physical power of arms. Like the feudal organizations of Medieval Europe, the Nobles had the power of life and death over their subjects, and to a much greater extent than the European nobles had. Each family lived on an allotted parcel of land and did a given job. Travel was restricted to a radius of a few miles. There was no money; there was no necessity for it, since the government of the Great Nobles took all produce and portioned it out again according to need. It was communism on a vast and--incomprehensible as it may seem to the modern mind--_workable_ scale. Their minds were as different from ours as their bodies were similar; the concept "freedom" would have been totally incomprehensible to them. [Illustration] They were sun-worshipers, and the Greatest Noble was the Child of the Sun, a godling subordinate only to the Sun Himself. Directly under him were the lesser Great Nobles, also Children of the Sun, but to a lesser extent. They exercised absolute power over the conquered peoples, but even they had no concept of freedom, since they were as tied to the people as the people were tied to them. It was a benevolent dictatorship of a kind never seen before or since. At the periphery of the Empire of the Sun-Child lived still unconquered savage tribes, which the Imperial forces were in the process of slowly taking over. During the centuries, tribe after tribe had fallen before the brilliant leadership of the Great Nobles and the territory of the Empire had slowly expanded until, at the time the invading Earthmen came, it covered almost as much territory as had the Roman Empire at its peak. The Imperial Army, consisting of upwards of fifty thousand troops, was extremely mobile in spite of the handicap of having no form of transportation except their own legs. They had no cavalry; the only beast of burden known to them--the flame-beasts--were too small to carry more than a hundred pounds, in spite of their endurance. But the wide, smooth roads that ran the length and breadth of the Empire enabled a marching army to make good time, and messages carried by runners in relays could traverse the Empire in a matter of days, not weeks.