Baron Ulbrexis
Infamous dissident from Sepheris Secundus, Baron Havalir Saerton Ulbrexis of Sepheris Secundus is a persuasive orator and leader of men who led a massive serf rebellion supported by countless mutants. His organization was called the Broken Chains: Preaching a heretical gospel of 'progress' and 'equality' the Broken Chains rose against the Imperial Governor. Millions were killed, including thousands of nobles, and the Broken Chains almost brought the mining operations of the planet to a halt. At last, he was hunted down by the Adeptus Arbites and executed by Judge Bannon for his crimes.
As it turned out the Baron was not entirely dead. He resurface many times over the following years, always following the same pattern: Gaining a place among the worker castes by preaching his deadly gospel. At the same time his mutant allies, led by Ulbrexis' second in command Assord Morir, would insinuate themselves along the local mutants, thereby gaining a strong fighting force. His most recent attempt at inciting global rebellion was the minor hive world of Baraspine, Adrantis sub.
The Baron is believed to have picked up his deviant ideas during his extended stay on Protasia: Havalir Saerton Ulbrexis was effectively sent to that accursed world as a hostage, to ensure that his father, then Baron Ulbrexis, did not fault on his loan payment to his Protasian bankers. As was so clearly exemplified by the Protasian rebellion: The world was a cesspool of dangerous and deviant thought; democracy, equality, religious freedom, technological progress - all values proven again and again to be detrimental to a stable society.