The cluster has known at least two great empires before it’s current decay, although a great deal of history has been lost when those cultures fell.
Most recently, the Ilyrian Empire dominated the cluster, creating wonders of technology that can only be guessed at now – they created the jump gates, and their capital planet remains a vast monument to the better life that used to be. Not that it was better for everyone, mind you. The resources needed to build the gates sucked many systems dry, and eventually caused the rebellion that managed to bring the Empire to it’s knees several centuries ago.
Before the Ilyrians was another culture, so long ago that not even it’s name is known. Oxide is the best proof of this culture’s existence, layered with aeons old junk from the older culture. Beyond a few assumptions, nothing is known of them. Presumably they didn’t use jump gates, or their gates were completely obliterated when they fell. If they didn’t have jump gates, they must have had some form of FTL travel, given the presence of very similar artifacts found on other systems in the cluster.