Ariannus is a Terran Federation colony world.
During the Great Expansion, several independent starship captains were hired to search for new worlds to colonize. One of these explorers was named Roger Lemli, who captained the SS Hades. Soon, he discovered the planet known as Ariannus, discovering great soil quality and mineral wealth in the mountains. The colonization was proven to be a success, with over 1 Billion colonists living on the planet.