[telotortium]

I realize citing Wikipedia risks some serious error, but my impression is that by late antiquity (after AD 200), the main philosophical systems in the Roman world were Christianity and Neoplatonism (itself heavily influenced by Christianity) and to a lesser extent Stoicism. Stoicism, Epicureanism, and Middle Platonism were more characteristic of Classical Antiquity (200 BC-200 AD). The Wikipedia page on Epicureanism[0] supports this impression: "By the late third century CE, however, there was little trace of its existence.[7] With growing dominance of Neoplatonism and Peripateticism, and later, Christianity, Epicureanism declined."

[0] https://en.wikipedia.org/wiki/Epicureanism