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Yep. The article points out "The stoicism that has become popular today draws on Seneca, Epictetus and Marcus Aurelius, three men living during the Roman Empire..." and discusses each. The same book I quoted has a similar sentence "The most important of the Roman Stoics—and the Stoics from whom, I think, modern individuals have the most to gain—were Seneca, Musonius Rufus, Epictetus, and Marcus Aurelius." Each of them gets a few pages of personal history, their refinements to or deviations from the Stoicism of their time, and how the two connect. I didn't want to post a ton of quotes to try to rebut every detail of the article, but you're right that I missed the opportunity to mention that's available as well.