by severa
A fragment of the Histories of Herodotus, from an ancient Egyptian papyrus
If you want to read about ancient history, your first instinct is probably to pick up a modern book about the subject. That's fine, but after a while you start to realize just how much modern history writing is basically the author's interpretation of a small handful of surviving texts. Going back to the original sources can be very enlightening as to how exactly we know what we know. It's not the only approach to history, but it is a good one.
When it comes to ancient Greece, it's easy to figure out who the most important surviving historians are, but it can be confusing to understand which other works to read and what goes when. Certainly it took me a while to figure it all out. So I thought it would be helpful to assemble a timeline that shows how all the surviving works of history from that time fit together. I'm not an expert, but I think I've managed to include pretty much everything of importance.
You don't need to read all of this in order - in fact you probably shouldn't. If you're getting into this for the first time and this list seems overwhelming, don't worry. You can just start with the basics and then fill in the gaps later. If you can only read two books, read Herodotus and Thucydides. If you can read two more books, read those and then move on to Xenophon's Hellenika, then Diodorus Siculus Books 16-20. These books alone will take you through the whole Classical Greek era, in an almost continuous narrative. And there are good editions of all four linked below.
When available, I would definitely recommend reading the Landmark translations. Preferably as real books, not e-books. They have great maps, copious footnotes, and very thorough appendices, all of which I found very helpful in getting my bearings. But you can also find free translations online of everything here.
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I had two main criteria for inclusion in this list. First, is it a work of history or biography about ancient Greece that was written during the Classical period (including by Romans)? Second, is this work complete enough to be read as a continuous narrative? That is, I excluded works which only survive in fragments. Those fragments are historically important, but it's hard to just read them without context. I did, however, include some fragments of works that are largely but not totally complete.
The time period covered goes from the earliest surviving sources to about when the Greek king Pyrrhus went to Italy to fight Rome in 280 BC. There are still important sources for Greek history after this time, but I've included them on the timeline for Roman history instead, since after that point Greek and Roman history became more and more intertwined.
I did exclude a few works from this list. For example, Diogenes Laertius's Lives of the Philosophers, since the history of philosophy is a bit too separate from everything else that's here.
Most works listed here cover a single time period and should be read as a single work, but there are a few, such as those of Diodorus Siculus and Justinus, that cover centuries of Mediterranean history, which I've therefore broken up by period. These works, which are essentially summaries of other, lost writings, aren't usually as important, but sometimes they cover crucial periods not discussed by our other surviving sources. In particular, Diodorus Siculus provides the only real account of the period before and after Alexander the Great.
There is no complete history of archaic Greece (that is, Greece before the Persian Wars starting around 500 BC), but there are a number of later surviving sources which discuss the period.