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@chjara

The Qaramitans had something similar going on

> Nasir Khusraw, who visited Hasa in 1051, recounted that these estates were cultivated by some thirty thousand Ethiopian slaves. He mentions that the people of Hasa were exempt from taxes. Those impoverished or in debt could obtain a loan until they put their affairs in order. No interest was taken on loans, and token lead money was used for all local transactions.

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