The Book of Isaiah is a book of the Jewish Hebrew bible as well as the Christian Old Testament, containing prophecies attributed to Isaiah. This book is often seen by scholars as being divided into at least two sections. The first section, consisting of chapters 1-39, is generally accepted as being written by the prophet Isaiah of Jerusalem, or by his followers who took down his words.
Isaiah prophesied during the reigns of four kings -- Uzziah (Azariah), Jotham, Ahaz, and Hezekiah. Legend has it that he was martyred during the reign of Manasseh, who came to the throne in 687 BCE. That he is described as having ready access to the kings would suggest an aristocratic origin.
This was the time of the divided kingdom, with Israel in the north and Judah in the south. There was prosperity for both kingdoms during Isaiah’s youth with little foreign interference. Jeroboam II ruled in the north and Uzziah in the south. The small kingdoms of Palestine, as well as Syria, were under the influence of Egypt. However, in 745 BCE, Tiglath-Pileser III came to the throne of Assyria.