The Simo society is a secret society in West Africa (esp. Ghana, Mali, Sierra Leone) also described as a "masked cult". It hails, according to a UNESCO report, from among either the Temne people or the Baga people at the time of the Mali Empire. The Susu people's political organization "assigned an important role to the Simo initiation society", and it "dominated" the organization of the Baga and the Landuma people. Initiation and other rites included masks, and of particular importance were fertility rites. The Simo were also one of many secret "cultic groups" (whose priests "possessed immense knowledge of herbs and roots") that practiced medicine to cure specific ailments.