Isaiah was a man who was from the Southern Kingdom of Judah. He was known as a "prophet" of the Lord. He was alive during the time that the Northern Kingdom of Israel was destroyed by the Assyrians. He was a mouthpiece of God and spoke during the reign of several kings of Judah: Uzziah, Jotham, Ahaz, and Hezekiah (around 765-695 B.C.). He continually wore a coarse linen or hairy overcoat of a dark color, which was typically worn by mourners.