Isaiah was an 8th-century BC prophet living in the Kingdom of Judah. He served as an oracle during the reigns of several kings, including Uzziah, Ahaz, and Hezekiah. He is the namesake of the biblical Book of Isaiah, a text that traditionally attributes its sixty-six chapters to him, though scholars debate whether the work represents a single author or a school of prophets. Recognized as a saint in various Christian traditions, he is remembered for his messages regarding the people of Israel and his role in advising King Hezekiah during Assyrian invasions.