Hiero (Greek: Ἱέρων, Hiéron) is a dialogue by Xenophon, in which the principal characters are Hieron I, tyrant of Syracuse, and the poet Simonides. Hieron explains the dangers of a tyrant's position compared to that of a private citizen, while Simonides argues that a tyrant can achieve happiness by ruling well.
The dialogue was the subject of a significant debate between the twentieth century philosophers Leo Strauss and Alexandre Kojeve.
Free Online Texts
Gutenberg: Hiero, English translation by H.G. Dakyns. Multiple formats.
Loebulus. L183 - Xenophon -- Scripta Minora: Hiero. Agesilaus. Constitution of the Lacedaemonians. Ways and Means. Cavalry Commander. Art of Horsemanship. On Hunting. Constitution of the Athenians. PDF of public domain Loeb edition in Greek and English.
University of Adelaide (Internet Archive): Hiero, English translation by H.G. Dakyns. Multiple formats.
Wikisource: Hiero, English translation by H.G. Dakyns. Downloads via Book Creator.
BBC Radio 4 In Our Time: Xenophon. Melvyn Bragg with Paul Cartledge, Edith Hall and Simon Goldhill.
Internet Encyclopedia of Philosophy: Xenophon, by Eve A. Browning.
Internet Archive: Restatement on Xenophon's Hiero, by Leo Strauss.
Wikipedia: Hiero (Xenophon).
The Great Conversation: Further Reading at Tom's Learning Notes
Machiavelli: The Prince.
Ancient Greek resources: Learn to read Greek classics in the original.