HIERO (strictly Hieron), the name of two rulers of Syracuse.
Hiero I. was the brother of Gelo, and tyrant of Syracuse from 478 to 467/6 B.C. During his reign he greatly increased the power of Syracuse. He removed the inhabitants of Naxos and Catana to Leontini, peopled Catana (which he renamed Aetna) with Dorians, concluded an alliance with Acragas (Agrigentum), and espoused the cause of the Locrians against Anaxilaus, tyrant of Rhegium. His most important achievement was the defeat of the Etruscans at Cumae (474), by which he saved the Greeks of Campania. A bronze helmet (now in the British Museum), with an inscription commemorating the event, was dedicated at Olympia. Though despotic in his rule Hiero was a liberal patron of literature. He died at Catana in 467.
See Diod. Sic. xi. 38-67; Xenophon, Hiero, 6. 2; E. Lübbert, Syrakus zur Zeit des Gelon und Hieron (1875); for his coins see [Numismatics] (section Sicily).
HIERO II., tyrant of Syracuse from 270 to 216 B.C., was the illegitimate son of a Syracusan noble, Hierocles, who claimed descent from Gelo. On the departure of Pyrrhus from Sicily (275) the Syracusan army and citizens appointed him commander of the troops. He materially strengthened his position by marrying the daughter of Leptines, the leading citizen. In the meantime, the Mamertines, a body of Campanian mercenaries who had been employed by Agathocles, had seized the stronghold of Messana, whence they harassed the Syracusans. They were finally defeated in a pitched battle near Mylae by Hiero, who was only prevented from capturing Messana by Carthaginian interference. His grateful countrymen then chose him king (270). In 264 he again returned to the attack, and the Mamertines called in the aid of Rome. Hiero at once joined the Punic leader Hanno, who had recently landed in Sicily; but being defeated by the consul Appius Claudius, he withdrew to Syracuse. Pressed by the Roman forces, in 263 he was compelled to conclude a treaty with Rome, by which he was to rule over the south-east of Sicily and the eastern coast as far as Tauromenium (Polybius i. 8-16; Zonaras viii. 9). From this time till his death in 216 he remained loyal to the Romans, and frequently assisted them with men and provisions during the Punic wars (Livy xxi. 49-51, xxii. 37, xxiii. 21). He kept up a powerful fleet for defensive purposes, and employed his famous kinsman Archimedes in the construction of those engines that, at a later date, played so important a part during the siege of Syracuse by the Romans.
A picture of the prosperity of Syracuse during his rule is given in the sixteenth idyll of Theocritus, his favourite poet. See Diod. Sic. xxii. 24-xxvi. 24; Polybius i. 8-vii. 7; Justin xxiii. 4.
HIEROCLES, proconsul of Bithynia and Alexandria, lived during the reign of Diocletian (A.D. 284-305). He is said to have been the instigator of the fierce persecution of the Christians under Galerius in 303. He was the author of a work (not extant) entitled λόγοι φιλαλήθεις πρὸς τοὺς Χριστιανούς in two books, in which he endeavoured to persuade the Christians that their sacred books were full of contradictions, and that in moral influence and miraculous power Christ was inferior to Apollonius of Tyana. Our knowledge of this treatise is derived from Lactantius (Instit. div. v. 2) and Eusebius, who wrote a refutation entitled Ἀντιῤῥητικὸς πρὸς τὰ Ἱεροκλέους.
HIEROCLES OF ALEXANDRIA, Neoplatonist writer, flourished c. A.D. 430. He studied under the celebrated Neoplatonist Plutarch at Athens, and taught for some years in his native city. He seems to have been banished from Alexandria and to have taken up his abode in Constantinople, where he gave such offence by his religious opinions that he was thrown into prison and cruelly flogged. The only complete work of his which has been preserved is the commentary on the Carmina Aurea of Pythagoras. It enjoyed a great reputation in middle age and Renaissance times, and there are numerous translations in various European languages. Several other writings, especially one on providence and fate, a consolatory treatise dedicated to his patron Olympiodorus of Thebes, author of ἱστορικοὶ λόγοι, are quoted or referred to by Photius and Stobaeus. The collection of some 260 witticisms (ἀστεῖα) called Φιλόγελως (ed. A. Eberhard, Berlin, 1869), attributed to Hierocles and Philagrius, has no connexion with Hierocles of Alexandria, but is probably a compilation of later date, founded on two older collections. It is now agreed that the fragments of the Elements of Ethics (Ἠθικὴ στοιχείωσις) preserved in Stobaeus are from a work by a Stoic named Hierocles, contemporary of Epictetus, who has been identified with the “Hierocles Stoicus vir sanctus et gravis” in Aulus Gellius (ix. 5. 8). This theory is confirmed by the discovery of a papyrus (ed. H. von Arnim in Berliner Klassikertexte, iv. 1906; see also C. Prächter, Hierokles der Stoiker, 1901).