2. One of the guards of Hieronymus, king of Syracuse, in the plot against whose life he joined. When Hieronymus had marched into Leontini, and had arrived opposite the house where the murderers were posted, Deinomenes, who was close behind him, stopped under pretence of extricating his foot from a knot which confined it, and thus checked the advance of the multitude, and separated the king from his guards. The assassins then rushed on Hieronymus and slew him. (B. C. 215.) His attendants turned their weapons against Deinomenes, but he escaped with a few wounds, and was soon after elected by the Syracusans one of their generals. (Liv. 24.7, 23.)