The first verse of the Book of Isaiah states that Isaiah prophesied during the reigns of Uzziah (or Azariah), Jotham, Ahaz, and Hezekiah, the kings of Judah (Isaiah 1:1). Uzziah's reign was 52 years in the middle of the 8th century BC, and Isaiah must have begun his ministry a few years before Uzziah's death, probably in the 740s BC. Isaiah lived until the fourteenth year of Hezekiah's reign (who died 698 BC), and may have been contemporary for some years with Manasseh. Thus Isaiah may have prophesied for as long as 64 years.
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