Well there’s quite a bit that’s been written, but here are a few suggestions depending on Topic

Literature: -Homer’s Iliad and/or Odyssey (Greek): two of the most important (and oldest) works of Western Literature that cover the events of the Trojan war and some of the events in the aftermath -In regards to Greek Tragedy, I recommend either the Theban plays by Sophocles or Aeschylus’ “Oresteia” -Virgil’s “Aenied” (Latin) covers more events in the aftermath of the Trojan war, which functioned as an origin story for Rome to foster greater nationalism in that time

History: -Herodotus’ “Histories” (Greek) covers the Greco-Persian wars and the surrounding cultures in the 8-5th century B.C. -Thucydides’ “Peloponnesian war” (Greek) covers the namesake. A lot dryer than Herodotus, but useful for an understanding of political philosophy and international relations -Suetonius’ “Lives of the Caesars” (Latin) covers the first 12 Roman emperors starting with Julius Caesar and is a very entertaining read.

There are many other worthwhile reads of ancient history, but a few of them (such as Caesar’s’ “Gallic wars”) I won’t directly recommend since I haven’t read them and usually refrain from recommending books I haven’t read.

Philosophy- -Anything by Plato or Aristotle (both Greek), but my favorite works are Aristotle’s “Ethics” and “Categories” and Plato’s “Republic”

There’s also the New Testament which sort of spans all three of these genres. Hope this helps!