The acts of Uzziah ... did Isaiah ... write - Most critics regard Isaiah as about 20 when Uzziah died. He must, then, have written his history of Uzziah’s reign from documents and accounts of others, rather than from his own knowledge.
Related Commentaries of 2 Chronicles 26:22
2 Chronicles 26:22
22 Now the rest of the acts of Uzziah, first and last, did Isaiah the prophet, the son of Amoz, write.