To be honest, I’m not comfortable with how many historical blogs here uncritically use the term POC or white in eras before the 1500s, after which European imperialism started to give birth to the modern concept of whiteness. It is inherently ahistorical to talk about certain Roman citizens being “POC” when the lines drawn were a bit more like Northern Europeans/Mediterraneans, rather than Europe/Africa. The North-South Europe divide still exists today, but it was even more pronounced in the Roman era when the Northerners were seen as savages and uncivilised people to be conquered.
It’s also an American term and classification outside the Americas sees whiteness differently + has other dimensions like ethnicity.
I’m inclined to see imposing modern race categories on eras before they exist as not only anachronistic but also something one should not do precisely because it is an inherent perpetuation of the European colonial worldview. Where whiteness is default, which isn’t much use in eras where many non-European civilisations were the most powerful political entities. Not to mention I think it dichotomises multi-ethnic empires that had both Europeans and non-Europeans in a manner akin to the “one-drop rule”.