Di Inferi

The di inferi or dii inferi were a shadowy collective of ancient Roman deities associated with death and the underworld. The epithet inferi is also given to the mysterious Manes, a collective of ancestral spirits. The most likely origin of the word Manes is from manus or manis, meaning "good" or "kindly," which was a euphemistic way to speak of the inferi so as to avert their potential to harm or cause fear.