 His history of the period 146 – 88 BCE is said to have filled 52 volumes.His "Histories" continue the account of the rise and expansion of Roman dominance, which he appears to have supported.Posidonius did not follow Polybius's more detached and factual style, for Posidonius saw events as caused by human psychology; while he understood human passions and follies, he did not pardon or excuse them in his historical writing, using his narrative skill in fact to enlist the readers' approval or condemnation.