Xavier Mendoza is known as one of the most notorious Inquisitors in the history of the Imperium. A fanatical enemy of Chaos, he quashed it wherever he believed it to be found. Shortly after the Horus Heresy he was convinced that all Space Marines were servants of the Chaos Gods and began a Holy War to destroy any remaining loyal Adeptus Astartes. His actions came to a head when he boarded a cruiser of the newly formed Black Templars chapter and accused the crew of harboring daemons. Declaring them heretics he had fifty Black Templars burned at the stake after a short trial. Soon after Mendoza was found dead, some think possibly as a result of assassination.