E.g. If it or distinct remnants made into Ancient Persia, Hellenistic, Rome, or Byzantine? I'm not counting the resurgance it's had in the late 20th or 21st centuries.
hi! here are a few previous threads to get you started
How did Buddhism spread to Japan and why it didn't spread to Europe?
Why didn't Buddhism spread west to the Mediterranean like it spread east into China?
Why didn't Buddhism spread westward towards Europe despite the contact between the Greeks and the Indoiranians after the conquests of Alexander the Great?
What do we know (if anything) about the buddhists who lived in the Hellenic / Roman world?
i have a question regarding Buddhism and Europe