[throwaway676712]

>Equating North Africans who genetically, culturally more interlinked with other Mediterranean people with Sub-Saharan Africans is not exactly right. After all before the Indo-European invasion Europe was almost exclusively settled by middle eastern immigrants (and largely remained so in Southern Europe genetically).

No, I mean that North African client kingdoms and tribes, or the Roman themselves, would routinely trade in slaves and hire mercenaries or bring in merchants through the trans-Saharan trade routes.

>It’s not a stretch to imagine a lot of things but there is no evidence that was true to any significant degree (besides the demand for slaves in Roman Egypt was likely substantial enough to absorb most of the demand)

There literally is, as pointed out at the top of my comment. You can look it up.