Sosylus of Lacedaemon

Sosylus of Lacedaemon was a Greek historian in the 3rd century BC. A contemporary of Hannibal, he accompanied him during the Second Punic War and is the author of the Deeds of Hannibal, a lost historical work of seven volumes; only fragments of the work are known. Sosylus taught Hannibal Greek.]

It is possible that Polybios may have used material from Sosylus' history for his writing about Hannibal in The Histories.