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Mansa Musa
Chuck Feeney
Li Ka-shin is another good answer. https://en.wikipedia.org/wiki/Li_Ka-shing who gained a bunch of money like Bill Gates and started his own foundation: https://en.wikipedia.org/wiki/Li_Ka_Shing_Foundation which works towards education reform, the foundation constantly builds and donates to universities to help them further the reach of impoverished students. Additionally, they support a lot of medical services and research to help impoverished areas of HK.
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