(Ἀρίμνηστος), the commander of the Plataeans at the battles of Marathon and Plataea. (Paus. 9.4.1; Hdt. 9.72; Plut. Arist. 100.11.) The Spartan who killed Mardonius is called by Plutarch Arimnestus, but by Herodotus Aeimestus. [AEIMNESTUS.]