3. POSTUMUS, a soothsayer, who predicted success to Sulla, and told him to keep him in chains, and put him to death if matters did not turn out well. Plutarch (Plut. Sull. 9) says that this occurred when Sulla was marching upon Rome, in B. C. 88; whereas Cicero (de Div. 1.33) and Valerius Maximus (1.6.4) relate that it happened before the battle in which Sulla defeated the Samnites.
A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890