Cyrene was a Greek colony on the North African coast, in what is now northeastern Libya, founded by settlers from Thera in the 7th Century BC. The early dates are largely conjectural, as are the individuals whose reigns they purport to indicate.
Kings of Cyrene, 632 - 440 BC
Battus I c.632-c.600 BC
Arcesilaus I c.600-c.583 BC
Battus II c.583-c.560 BC
Arcesilaus II c.560-c.550 BC
Battus III c.550-c.530 BC
Arcesilaus III c.530-515 BC
Battus IV 515-470 BC
Arcesilaus IV 470-440 BC
In 440 BC, Cyrene became a Republic, under Persian suzerainty (as had been the latter kings from Arcesilaus III). It was conquered by Alexander the Great in 331 BC, and fell to the portion of Ptolemy I in the division of Alexander's Empire. In 276 BC, it reasserted its independence.
In 249 Cyrene again became a republic, but was restored to Ptolemaic control in 246 BC. From 163, Cyrene occasionally had its own rulers from the Ptolemaic dynasty. It fell to Rome in 75 BC.
In 75, the city became part of a Roman province, but it was restored to the Ptolemies by Mark Antony in 37 BC. In 34 BC, Cleopatra and Antony's daughter, Cleopatra Selene, was made Queen of Cyrene, but the city returned to Rome following Augustus's conquest of Egypt in 30 BC.
His family claimed descent from the ancient Athenian kings, and he was related – though there is disagreement as to exactly how – to the prominent politician Critias.
Plato describes these "philosopher kings" as "those who love the sight of truth" (Republic 475c) and supports the idea with the analogy of a captain and his ship or a doctor and his medicine.
However, the philosopher king image was used by many after Plato to justify their personal political beliefs.