Hades is the last inhabited world around the Alcyone system’s fifth star.  It’s a sulfur-rich world, but despite the name, it’s extremely cold on average, with ice sheets stretching from the poles to near the equator.  Constantinople used the ice to their advantage and turned it into a major transshipping center, the central storage facility for trade in the Pleiades Cluster and into Peloran space.  Not surprisingly, the locals have mastered the winter sports.