No. The monarchy was in power.
Starting in Isaiah 1:1 the book addresses Judah and Jerusalem with warnings and prophecies from the time of King Uzziah (740 B.C.) to the time of Hezekiah (681 B.C.) leading up to the Babylonian captivity.
Isaiah, son of Amoz, wrote of things he saw during the reigns of Kings Uzziah, Jotham, Ahaz and Hezekiah. He therefore began his career around 740 BCE and could have continued for more than forty years from that time. Israel fell to the Assyrians in 722 BCE, so it was still nominally independent, although a vassal state, during his early years. In his later years, Israel was no more, with many of its people transferred to other parts of the Assyrian Empire, where they gradually lost their separate ethnic identity and assimilated into the host cultures. This probably occurred around the mid-point of Isaiah's career as a prophet and writer. The southern kingdom, Judah remained at least nominally independent during the life of Isaiah. However, there were two further, anonymous authors who lived long after the time of Isaiah and contributed to the Book of Isaiah, after Judah fell to the Babylonians and the people were taken into Exile. Because we do not know their real names, these authors are referred to as Second Isaiah (II Isaiah) and Third Isaiah (III Isaiah).
It was the prophet Isaiah.
The main characters in The Book of Isaiah are the prophet Isaiah, King Ahaz, King Hezekiah, and the people of Judah and Jerusalem. Isaiah prophesies about the coming judgment on Israel, the restoration of God's people, and the future Messiah.
Samuel, Isaiah, Jeremiah, Elijah.See also:More about the Israelite prophets
Isaiah was a prophet who lived during the 8th-century B.C. in the Kingdom of Judah before it fell to the Babylonians. Isaiah is credited as the author of the book by the same name in the Bible and often quoted in the New Testament.
Isaiah.
Very many prophets, most of whose names are not recorded (Talmud, Megillah 14a). Those whom we do know, include Nathan, Gad, Isaiah, Jeremiah, Ezekiel, Joel, Nachum, Zephaniah, Habakkuk, Haggai, Zechariah, and Malachi.See also:More about the Israelite prophets
Isaiah served under 4 kings as a prophet. In his notes on Isaiah in his Study Bible, John MacArthur says:- Isaiah, son of Amoz, ministered in and around Jerusalem as a prophet to Judah during the reigns of 4 kings of Judah: Uzziah (called "Azariah" in 2 Kings), Jotham, Ahaz, and Hezekiah (1:1) from ca. 739-686BC.
He lived in Jerusalem, in the kingdom of Judah.
The prophet you are referring to is Jeremiah. He ministered in Judah before the Babylonian Captivity and later sent letters to the exiles in Babylon, encouraging them to settle and seek the welfare of the city. After the captivity, he also addressed the remnant that had fled to Egypt, providing guidance and warning against disobedience to God. Jeremiah's prophetic ministry spanned a critical period of transition for the people of Israel.
Isaiah was a prophet in the Hebrew Bible who lived in the 8th century BCE. He delivered messages from God to the people of Judah about their behavior and the consequences of their actions. He was not a politician, but rather a spiritual leader.