Protecting spirits, Latin Genii, analogous to the guardian angels invoked by the Church of Rome.
The belief in such spirits existed both in Greece and Rome. The Greeks called them daimones, daemons, and appear
to have believed in them from the earliest times, though Homer does not mention than. Hesiod (Op. Et Dies,235)
speaks of daimones, and says that they were 30,000 in number, and that they dwelled on earth, unseen by mortals,
as the ministers of Zeus, and as the guardians of men and justice.
He further conceives them to be the souls of righteousness men who lived in the golden age of the world.
The Greek philosophers took up this idea, and developed a complete theory of daemons. Thus we read in Plato, that
daemons are assigned to men at the moment of their birth, that thenceforward they accompany men through life,
and after death they conduct their souls to Hades. Pindar, in several passages,speaks of a genethlios daimon, that
is, watching over the fate of man from the hour of his birth, which appears to be the same as the "dii genitales of
the Romans.
The daemons are further described as the ministers and companions of the gods, who carry the prayers of men to
gods, and the gifts of the gods to men and accordingly float in immense numbers in the space between heaven and
earth. The daemons, however, who were exclusively the ministers of the gods, seem to have constituted a distinct
class; thus the Corybantes, Dactyls, and Caberiri are called the ministering daemons of the great gods; Gigon,
Tychon, and Orthages are the daemons of the Aphrodite Gignon; Hadreus, the daemon of Demeter, and Acratus,
the daemon of Dionysus. It should however, be observed that all daemons were divided into great classes; viz.
good and evil daemons. The works which contain most information on this interesting subject are Appuleius, De Deo
Socratis, and Plutarch, and De Defectu Oraculorum. Later writers apply the term daemones also to the souls of the
departed.
This is a very interesting subject and would take hours and hours to view all the info, this link is useful;
https://en.wikipedia.org/wiki/Eudaemon_(mythology)