The words of Amos, who was among the herdsmen of Tekoa, which he saw concerning Israel in the days of Uzziah king of Judah, and in the days of Jeroboam the son of Joash king of Israel, two years before the earthquake.
So it puts him really just a little before Isaiah. Isaiah began his prophecy at the death of Uzziah. Remember in the sixth chapter, "In the year that king Uzziah died, I saw the Lord high and lifted up, sitting upon the throne, His train did fill the temple." Isaiah exercised his ministry mainly during the times of Hezekiah. So during the time of Uzziah, who was a prosperous king in Judah, reigned for fifty-two years,