c.927 - c.850 BC
Eljiah, or Elias, saved the the Yahweh religion from corruption by nature worship of Baal.
During the time of king Ahab, Phoenician deitis were introduced and worshipped in Israel. The prophet Elijah became the leader of the Jehovic countermovement.
Elijah denounced the courtly corruption and attacked the Baal cult. Elijah proclaimed that there was no reality except the God of Israel. He also taught the idea of salvation being bestowed on the purified true believers.
www link :
Comprehensive Biography from a catholic website.