Concerning the ancient sources for Alexander the Great, I noticed you mention time and again many Roman writings, like Arrian. Do we not have any noteworthy Eastern sources dealing with Alexander? - Persian, even if contemporary to Rome, for example? Or from the territories he conquered or fought in
Great question and...alas, not really. See below, but first, here is a collection of pretty much all we have on Persia, by Amelie Kuhrt. It's currently pretty on sale, so grab it now if you want it.
Sources from Achaemenid Persia are few and far between, as much of it didn't survive Alexander (not necessarily intentionally). There are Babylonian and other Mesopotamian chronicles, which are important. We also have the Achaemenid Royal Inscriptions. But the ancient near east didn't write narrative history in the same way Greece and Rome did. Kuhrt discusses ANE traditions in her book.
We also have Indian traditions about him, but these are in languages Classicists rarely/never read, alas. But there has been some important work done on Alexander in Vedic traditions. MORE NEEDS TO BE DONE. We need to be talking more to our Indian colleagues.
Finally, there is work on the archaeology of Central Asia, as well, but the reports are primarily in Russian. Look up material on the Greco-Baktrian Kingdom.
So it's there, but not in the massive amounts we get from the West. The Sasanids do talk about Alexander...and it's not flattering. But we just don't have a lot pre-Sasanid.
