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TIL about the Cagots, a group of people in France and Spain who experienced systemic hatred and discrimination because... they were Cagots.

They weren't any different from the other people living near them - same skin and hair color, same language, same religion, etc. - but if you were born to a Cagot family, you were a Cagot, and the rest of the people hated and shunned you. And nobody nowadays knows why; the origins of the discrimination have been lost to time.

https://en.wikipedia.org/wiki/Cagot