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'Hieron II', king of Syracuse from 270 to 215 BC, was the illegitimate son of a Syracusan noble, Hierocles, who claimed descent from Gelon. He was a former general of Pyrrhus of Epirus and an important figure of the First Punic War.
On the departure of Pyrrhus from Sicily (275 BC) the Syracusan army and citizens appointed him commander of the troops. He 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, and proceeded in harassing the Syracusans. They were finally defeated in a pitched battle near Mylae by Hieron, who was only prevented from capturing Messana by Carthaginian interference. His grateful countrymen then made him king (270).
In 264 BC he again returned to the attack, and the Mamertines called in the aid of Rome. Hieron at once joined the Punic leader Hanno, who had recently landed in Sicily; but being defeated by the consul Appius Claudius Caudex, 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 215 BC 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.
According to a story told by Vitruvius (De architectura IX.9–12), Hiero was given a golden crown by a goldsmith and asked Archimdedes to find out if it really was pure gold. Archimedes, on discovering the principle of displacement needed to measure the density of the crown is said to have shouted "eureka, eureka!" while running naked through Syracuse. Vitruvius concludes this story by stating that Archimedes' method successfully detected the goldsmith's fraud.
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-vu. 7; Justin xxiii. 4.

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References

References

★ "The Rise of Hiero" from Polybius, ''Histories'' at Perseus;

★ "Hiero and Rome" from Polybius, ''Histories'' at Perseus;

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|width=25% align=center|'Preceded by:'
'Controlled by Pyrrhus of Epirus '
|width=25% align=center|'Tyrant of Syracuse'
275 BC– 215 BC
|width=25% align=center|'Succeeded by:'
'Hieronimus'
|-