Maona
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A maona (from the Arabic Maounach) or Societas comperarum was a medieval Italian association of investors formed to manage the purchased shares (loca or partes) of the revenue due to the relevant city-state through tax farming; the shares were individually sold to wealthy merchants, but the collection could be difficult and so these merchants would band together. These organizations were usually temporary, and could sometimes be extremely aggressive in extracting the monies due them; their actions went up to, and included, outright conquest. Maona were especially common in Genoa.