frankie's Journal: Historical Guide to the Baroque Cycle?

After a few years of halted attempts, I am finally at the halfway point of Stephenson's trilogy and progressing steadily. I hope more will be revealed about the nature and plans of Enoch Root, but currently I'm more interested in the side characters and their real-world timelines. For example, Duc d'Arcachon. Did he really exist? When and how did he die? etc? So far both Google and Wikipedia have only pointed me to Stephenson-related pages.