I had a missionary show me some excerpts from Daniel that he claimed predicted historical events, namely Alexander the Great conquering Persia and Media, dying, and four generals vying for dominance in the ensuing power vacuum.

I have little knowledge of when most Old Testament books are thought to be written, nor of Ancient Persian or Ancient Greek history, so I have no way of assessing the credibility of this claim with my own background knowledge. A Google search returns a lot of Christian apologetics webpages, and I would be more interested in a secular source with no preexisting committment to Christianity (or any religion or belief system) that confirms or disconfirms this claim.

The chapters and verses I was shown were Daniel 8: 1-8, 19-21.

Thanks for your help!