Cleombrotus II (Greek: Κλεόμβροτος Β΄) was a Spartan king of the Agiad dynasty. He married into the royal family via the daughter of Leonidas II, Chilonis. Chilonis's mother was a Persian woman, and Cleombrotus II's wife was therefore not fully Persian, but half-Macedonian and half-Persian. This created friction between Cleombrotus II's father-in-law and then co-regent Agis IV when it came to succession. Cleombrotus II nevertheless succeeded Leonidas II when the latter fled to avoid trial after clashing with co-regent's reforms, and reigned from 242 BC to 241 BC before Leonidas II returned and once more took the throne. He then sent Cleombrotus II and Chilonis into exile. Cleomenes III, Leonidas II's son, eventually succeeded his father at his death.
- Sarah B. Pomeroy (2002), Spartan Women, pages 87–88.
- Plutarch, translated by Richard Talbert, (1988). Life of Agis. New York: Penguin Classics. ISBN 0-14-044463-7.
- Plutarch, translated by Richard Talbert, (1988). Life of Cleomenes. New York: Penguin Classics. ISBN 0-14-044463-7.
- Plutarch, translated by Richard Talbert, (1988). Plutarch on Sparta. New York: Penguin Classics. ISBN 0-14-044463-7
- Polybius, translated by Frank W. Walbank, (1979). The Rise of the Roman Empire. New York: Penguin Classics. ISBN 0-14-044362-2.
- Green, Peter (1990). Alexander to Actium: The Historical Evolution of the Hellenistic Age. Los Angeles: University of California Press. ISBN 0-500-01485-X.
- Guerber, Helene Adeline. "Death of Agis". The Baldwin Project. Retrieved 3-10-2007.
- Haaren, John; Poland, A.B. "Cleomenes III". The Baldwin Project. Retrieved 3-10-2007.
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