The Janssen incident of 1534 Post Exodus is widely believed to have popularized the “Para-Imperium” nickname for the Federation of Parahuman Species.
Janssen is a carbon world with eight times Earth’s mass inhabited by a few thousand miners with extreme pantrophic modifications to withstand the planet’s gravity. For the first couple centuries of the system’s occupation one of the Houses of the inhabited moon of Janssen IV avoided taxes for planetside operations by disguising their cyborg workforce as AI-driven robots. Their attempts to maintain this ruse culminated in the death of the system’s Emissary, drawing the attention of the Federal Guard.
While most would agree that the House’s Exile was justified, many felt that the Guard’s heavy-handed approach, in particular their use of ortillery, was unjustified. This had the unintentional effect of giving many in the Rim Worlds the impression that they were more subjects than members of the Federation.