Helios was a Greek sun god.
However, this deity is not necessary Greek in origin since the concept of a sun god was universal in the ancient world, but in the Theogomy he is identified as the son of Hyperion and his sister was Euryphaessa.
He drives a chariot of the sun by day and descends into the ocean at night. On Rhodes, his cult center, is allegedly the site of the largest Greek statue of a deity, the «Colossus» of Rhodes, cast in bronze.
It was there that the festival of Helios was celebrated in which a chariot with four horses was driven off a cliff, symbolizing the setting of the sun into the sea. A.G.H.
Jordan, Michael, Encyclopedia of Gods, New York, Facts On File, Inc. 1993, p. 100