Passage: Many influential intellectuals and progressive politicians counted themselves as members, including Ferdinand of Brunswick and the diplomat Xavier von Zwack, who was the Order's second-in-command. It attracted literary men such as Johann Wolfgang von Goethe and Johann Gottfried Herder and the reigning dukes of Gotha and Weimar.In subsequent use, "Illuminati" has referred to various organisations which have claimed or have been claimed to be connected to the original Bavarian Illuminati or similar secret societies, though these links have been unsubstantiated.  These organisations have often been alleged to conspire to control world affairs, by masterminding events and planting agents in government and corporations, in order to gain political power and influence and to establish a New World Order.  Central to some of the more widely known and elaborate conspiracy theories, the Illuminati have been depicted as lurking in the shadows and pulling the strings and levers of power in dozens of novels, films, television shows, comics, video games, and music videos.

Question: What was Xavier's profession?
diplomat