“The name Elijah (the Lord’s strength) given to the infant defined his whole life. From the years of his youth he dedicated himself to the One God, settled in the wilderness and spent his whole life in strict fasting, meditation and prayer. Called to prophetic service, which put him in conflict with the Israelite king Ahab, the prophet became a fiery zealot of true faith and piety.”
From this site, where you can read his whole story.
The Prophet Elijah is commemorated on July 20.