osiris4dOsiris, one of the most important gods of ancient e orin of Osiris is obscure; he was a local god of Busiris, in Lower Egypt, and may have been a personification of chthonic (underworld) fertility.By about 2400 bce, however,Overview. Osiris, the Mhty One, was both god of the dead and a central fure of Egyptian mythology.His cult arose around 2600BCE, as those of competing deities,