Imperium is a science fiction board wargame designed by Marc W. Miller, and published in 1977 by the Conflict Game Company and Game Designers' Workshop (GDW). It features asymmetrical forces, the two sides having its unique set of constraints. The game came in a cardboard box illustrated with a space battle on the exterior. It included a cardboard-mounted, folding map of a local region of the Milky Way galaxy, a set of rules and charts, and the 352 counters representing the various spacecraft, ground units, and markers, and a six-sided die. A second edition was published in 1990, a third in 2001, and the first edition republished in 2004. Description Imperium is a two-player game simulating a series of conflicts between the emerging Terran (human) Confederation and an immense and ancient alien empire, the Imperium. The Sun and nearby stars lie at the extreme edge of this alien space-faring civilization, and the Terrans struggle to survive and expand against this powerful state. While the Terran player is in control of the entire Confederation military, the Imperial player represents a low-ranking provincial governor on the frontier, who is forced to petition the central government for reinforcements and is occasionally subject to its meddling. When Imperium was published in 1977, its scenario was not connected to any other game. GDW published Traveller in the same year, but Traveller was at that point a system for running adventures in a generic science fiction setting, with no established background. However, as the company constructed the Third Imperium as the default setting for Traveller, the situation in Imperium was retconned into the Traveller Imperium's history; it became the First Interstellar War, the first of many wars leading to the overthrow of the Vilani Grand Empire of Stars (Ziru Sirka) by the Terran Confederation and the establishment of the Rule of Man. The fold-out map depicts a nearby region of the Galaxy that includes important nearby stars as well as hyperspace jump routes between them. This sector forms a single province within the Imperium. The map is printed on a dark background and is overlaid by a hex grid. Each hex represents a half parsec, which would require about 1.8 years to traverse traveling at 90% the speed of light. Along the edges of the map are tracks for marking turns and tallying resources. The map includes a number of commonly known stars, such as Alpha