Vodun cosmology centers around the "vodun" spirits and other elements of divine essence that govern the Earth, a hierarchy that range in power from major deities governing the forces of nature and human society to the spirits of individual streams, trees, and rocks, as well as dozens of ethnic vodun, defenders of a certain clan, tribe, or nation. The "vodun" are the center of religious life. Perceived similarities with Roman Catholic doctrines such as the intercession of saints and angels allowed Vodun to appear compatible with Catholicism, and helped produce syncretic religions such as Haitian Vodou. Adherents also emphasize ancestor worship and hold that the spirits of the dead live side by side with the world of the living, each family of spirits having its own female priesthood, sometimes hereditary when it's from mother to blood daughter.