Tried asking this on the Reddit history pages, immediately removed for asking for a "basic fact", meanwhile sourcing is near impossible to find.
Ive been trying to find more sources on the origins of the racial identity construct, particularly in the development of widespread white supremacy, and how the "white" identity developed. In my research, it has seemed very clear that it developed in conjunction with the Catholic Church's rise to power at the continental scale. In this same location, fertile birthing grounds for settler-colonialism, capitalism, and white supremacy. Any recommended reading on the subject would be greatly appreciated.
Furthermore, as the title stated, I am looking for the earliest recorded instances of one peoples inflicting subhumanization behavior on another. Obviously conflict between different groups of people traces far back before recorded history, but I am very interested in finding when a group first identified as "pure" human, while declaring all those without said traits subhuman. I have a feeling there must be some Marxist text on this, so if anyone knows it I'd love to see it.
Selfish plug to the research I've done thus far if anyone wants to check it out
The closest thing I can come up with is the sort of vague "Othering" that is found in the primary texts of Roman senators talking about the provincial people, especially those not in the empire as uncivilized barbarians. I forget whether it's Pliny the Elder or someone else, but I would start there. I dunno if it meets the criteria of "subhumanisation" since I never read it, if I had to guess though it probably existed in small instances for all of human history but never caught on until it was institutionalised with race science and racism in general. Another possibility is that women were the first to get the subhuman treatment since they were at the very least seen as nothing more than children since antiquity, so I wouldn't be surprised if that veered into dehumanisation.
there was also a disdain for the 'decadent' eastern cultures, primarily syrians and monotheists, in rome as well.
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Interesting, I wonder how this links up with the Marxist idea that patriarchy emerged along with wealth surpluses to create hereditary inheritence and built upon a biological division of labour (i.e. people with wombs and those without)