Mr. Lewis Campbell, in the Preface to his very useful edition of this dialogue (p. lxxi. Oxford, 1861), considers that the battle in which Theætêtus is represented as having been wounded, is probably meant for that battle in which Iphikrates and his peltasts destroyed the Spartan Mora, B.C. 390: if not that, then the battle at the Isthmus of Corinth against Epaminondas. B.C. 369. Schleiermacher in his Einleitung to the dialogue (p. 185) seems to prefer the supposition of some earlier battle or skirmish under Iphikrates. The point can hardly be determined. Still less can we fix the date at which the dialogue was written, though the mention of the battle of Corinth certifies that it was later than 394 B.C. Ast affirms confidently that it was the first dialogue composed by Plato after the Phædon, which last was composed immediately after the death of Sokrates (Ast, Platon's Leben, &c., p. 192). I see no ground for this affirmation. Most of the commentators rank it among the dialectical dialogues, which they consider to belong to a later period of Plato's life than the ethical, but to an earlier period than the constructive, such as Republic, Timæus, &c. Most of them place the Theætêtus in one or other of the years between 393-383 B.C., though they differ much among themselves whether it is to be considered as later or earlier than other dialogues--Kratylus, Euthydemus, Menon, Gorgias, &c. (Stallbaum, Proleg. Theæt. pp. 6-10; Steinhart, Einleit. zum Theæt. pp. 100-213.) Munk and Ueberweg, on the contrary, place the Theætêtus at a date considerably later, subsequent to 368 B.C. Munk assigns it to 358 or 357 B.C. after Plato's last return from Sicily (Munk, Die natürliche Ordnung der Platon. Schr. pp. 357-597: Ueberweg, Ueber die Aechtheit der Platon. Schr. pp. 228-236).] [Side-note: Question raised by Sokrates--What is knowledge or Cognition? First answer of Theætêtus, enumerating many different cognitions. Corrected by Sokrates.]