Isaiah (aɪˈzaɪ.ə or aɪˈzeɪ.ə; , Yəšaʿyāhū, "Yahweh is Salvation"), also known as Isaias or Esaias, was the 8th-century BC Israelite prophet after whom the Book of Isaiah is named.
Within the text of the Book of Isaiah, Isaiah is referred to as "the prophet", but the exact relationship between the Book of Isaiah and the actual prophet Isaiah is complicated. The traditional view is that all 66 chapters of the book of Isaiah were written by one man, Isaiah, possibly in two periods between 740 BC and c. 686 BC, separated by approximately 15 years, and that the book includes dramatic prophetic declarations of Cyrus the Great in the Bible, acting to restore the nation of Israel from Babylonian captivity. Another widely held view is that parts of the first half of the book (chapters 1–39) originated with the historical prophet, interspersed with prose commentaries written in the time of King Josiah 100 years later, and that the remainder of the book dates from immediately before and immediately after the end of the exile in Babylon, almost two centuries after the time of the historical prophet, and perhaps these later chapters represent the work of an ongoing school of prophets who prophesied in accordance with his prophecies.
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. 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. He may have been contemporary for some years with Manasseh. Thus, Isaiah may have prophesied for as long as 64 years.
According to some modern interpretations, Isaiah's wife was called "the prophetess", either because she was endowed with the prophetic gift, like Deborah and Huldah, or simply because she was the "wife of the prophet". They had two sons, naming the elder Shear-Jashub, meaning "A remnant shall return", and the younger Maher-Shalal-Hash-Baz, meaning, "Quickly to spoils, plunder speedily.