The LORD says that His revealing of future events before their occur is proof of who He IS. One of the Most Astounding Biblical Prophecies—A person is named in v. 1 as Cyrus.
Cyrus is an identifiable person in history, mentioned also in II Chronicles 36, Ezra 1-4, and Daniel 1-10. Cyrus ruled Persia from 559 to 530 BC. There is nothing extraordinary so far, except when you look back at when Isaiah wrote this chapter.
For the biblical facts, look at Isaiah 6. When did Isaiah start writing? “The year that King Uzziah died”. When was that? 739BC. That date happens to be exactly 200 years BEFORE Cyrus was the King that Ezra & Daniel are writing about.
Only God would know such a thing. Only God could know who will rule on Earth and when. Only God’s Word has historical facts prophetically revealed hundreds and even thousands of years before they happen.
In God’s Word, we hold history written in advance, called Biblical Prophecy. See video by DTBM: