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  3. "Eusebius, probably after Julius Africanus in the early 3rd century"; Walter Bauer, known for his groundbreaking work "Orthodoxy and Heresy in Earliest Christianity" (1934), famously wrote that Eusebius's bishops from Mark to Demetrius "are and remain for us a mere echo and a puff of smoke." Bauer is the guy who did the heavy lifting on traditional claims of an orthodox succession in Egypt beginning with Mark and discovered them to be insubstantial.