This is a link to a site that links to a large selection of what I call Hard Core Classics, these are some of the oldest of the classical works given to the public.
http://classics.mit.edu/Browse/index.html
Greco-Roman Authors
Aeschines
Wrote in Greek
390-314 B.C.E.
Aeschylus
Wrote in Greek
525-456 B.C.E.
Aesop
Wrote in Greek
6th century B.C.E.
Andocides
Wrote in Greek
440-391 B.C.E.
Antiphon
Wrote in Greek
480-411 B.C.E.
Apollodorus
Wrote in Greek
140 B.C.E.
Apollonius
Wrote in Greek
ca. 295 B.C.E.
Apuleius
Wrote in Latin
124 A.C.E.-ca. 170 A.C.E.
Aristophanes
Wrote in Greek
450-388 B.C.E.
Aristotle
Wrote in Greek
384-322 B.C.E.
Marcus Aurelius
Wrote in Latin
121-180 A.C.E.
Augustus
Wrote in Latin
63 B.C.E.-14 A.C.E.
Bacchylides
Wrote in Greek
5th century B.C.E.
Julius Caesar
Wrote in Latin
100-44 B.C.E.
Cicero
Wrote in Latin
106-43 B.C.E.
Demades
Wrote in Greek
380-319 B.C.E.
Demosthenes
Wrote in Greek
384-322 B.C.E.
Dinarchus
Wrote in Greek
360-292 B.C.E.
Diodorus
Wrote in Greek
1st century B.C.E.
Epictetus
Wrote in Greek
55-105 A.C.E.
Epicurus
Wrote in Greek
341-270 B.C.E.
Euclid
Wrote in Greek
ca. 300 B.C.E.
Euripides
Wrote in Greek
484-406 B.C.E.
Galen
Wrote in Greek
129-216 A.C.E.
Herodotus
Wrote in Greek
484-430 B.C.E.
Hesiod
Wrote in Greek
700 B.C.E.
Hippocrates
Wrote in Greek
460-377 B.C.E.
Hirtius
Wrote in Latin
90-43 B.C.E.
Homer
Wrote in Greek
800 B.C.E.
Horace
Wrote in Latin
65-8 B.C.E.
Hyperides
Wrote in Greek
390-322 B.C.E.
Isaeus
Wrote in Greek
420-350 B.C.E.
Isocrates
Wrote in Greek
436-338 B.C.E.
Josephus
Wrote in Greek
37-100 A.C.E.
Livy
Wrote in Latin
59 B.C.E.-17 A.C.E.
Lucan
Wrote in Latin
39-65 A.C.E.
Lucretius
Wrote in Latin
1st century B.C.E.
Lycurgus
Wrote in Greek
390-324 B.C.E.
Lysias
Wrote in Greek
445-380 B.C.E.
Ovid
Wrote in Latin
43 B.C.E.-17 A.C.E.
Pausanias
Wrote in Greek
143-176 A.C.E.
Pindar
Wrote in Greek
518-438 B.C.E.
Plato
Wrote in Greek
428-348 B.C.E.
Plotinus
Wrote in Greek
205-270 A.C.E.
Plutarch
Wrote in Greek
46-119 A.C.E.
Porphyry
Wrote in Greek
234-305 A.C.E.
Quintus
Wrote in Greek
ca. 375 A.C.E.
Sophocles
Wrote in Greek
496-406 B.C.E.
Strabo
Wrote in Greek
64 B.C.E.-23 A.C.E.
Tacitus
Wrote in Latin
56-120 A.C.E.
Thucydides
Wrote in Greek
460-404 B.C.E.
Virgil
Wrote in Latin
70-19 B.C.E.
Xenophon
Wrote in Greek
431-349 B.C.E.
Other Authors
Confucius
Wrote in Chinese
551-479 B.C.E.
Lao-tzu
Wrote in Chinese
6th century B.C.E.
Sun Tzu
Wrote in Chinese
4th century B.C.E.
Ferdowsi
Wrote in Persian
935-1020 A.C.E.
Omar Khayyam
Wrote in Persian
1048-1141 A.C.E.
Sa'di
Wrote in Persian
1213-1291 A.C.E.
Just a bit of candy for the old brain box, enjoy