Selloi were inhabitants of Epirus

Epirus

The name Epirus, from the Greek "Ήπειρος" meaning continent may refer to:-Geographical:* Epirus - a historical and geographical region of the southwestern Balkans, straddling modern Greece and Albania...

 of ancient Greece, in a region between Dodona

Dodona

Dodona in Epirus in northwestern Greece, was an oracle devoted to a Mother Goddess identified at other sites with Rhea or Gaia, but here called Dione, who was joined and partly supplanted in historical times by the Greek god Zeus.The shrine of Dodona was regarded as the oldest Hellenic oracle,...

 - where existed the oldest reported oracle - and Achelous

Achelous

In Greek mythology, Achelous was the patron deity of the "silver-swirling" Achelous River, which is the largest river of Greece, and thus the chief of all river deities, every river having its own river spirit. His name is pre-Greek, its meaning unknown...

 river. Aristotle names this area ancient Hellas. There the Selloi dwelt and those who were formerly called Graeci (Graekhes) and later Hellenes. According to Homer

Homer

In the Western classical tradition Homer , is the author of the Iliad and the Odyssey, and is revered as the greatest ancient Greek epic poet. These epics lie at the beginning of the Western canon of literature, and have had an enormous influence on the history of literature.When he lived is...

, they were priests of the Dodonian Zeus

Zeus

In the ancient Greek religion, Zeus was the "Father of Gods and men" who ruled the Olympians of Mount Olympus as a father ruled the family. He was the god of sky and thunder in Greek mythology. His Roman counterpart is Jupiter and his Etruscan counterpart is Tinia.Zeus was the child of Cronus...

. "King Zeus, lord of Dodona, god of the Pelasgi, who dwellest afar, you who hold wintry Dodona in your sway, where your prophets the Selloi dwell around you."

Some Greek scholars assert that the name Selloi was modified to Sellanes (like Akarnanes)and then to Hellanes-Hellenes.
(Compare PIE

Pie

A pie is a baked dish which is usually made of a pastry dough casing that covers or completely contains a filling of various sweet or savoury ingredients....

 *sa(e)wol (or soh₂wol,Lt.sol,Gk.helios,Sanskr.suryah. A similar etymology applies for the name "Helen" probably derived from "Selene" (moon) and connected with the Vedic

Vedic

Vedic may refer to:* the Vedas, the oldest preserved Indic texts** Vedic Sanskrit, the language of these texts** Vedic period, during which these texts were produced** Vedic pantheon of gods mentioned in Vedas/vedic period...

svarana (the shining one).