Thucydides history of the Peloponnesian war is an incredible work. Without it, I doubt we would know much about Themistocles, Pericles, etc.
When I was in high school, my Brother checked it out of his college library because he knew I was interested in ancient history.
The book was both fascinating and a bit tough to read. It was so long that I don’t remember a lot of it.
I just realized I put Themistocles in the Peloponnesian war. Of course he was much earlier than that.
Merry Christmas!