To Rhianus in his epic Aristomenes is the hero and he is to him a great men as is the Achilles of the Iliad to Homer (IV 6,3). The Aristodemus of Myron is a bit earlier than the Aristomenes of Rhianus. Myrons history of the Messenian war is in prosa, Rhianus has made an epic.
Rhianus's work features Aristomenes as its central figure and portrays him as a remarkable individual, similar to how Homer depicts Achilles in the Iliad (IV 6,3). The earlier Aristodemus of Myron is distinct from Rhianus' Aristomenes. Rhianus wrote his history of the Messenian war in straightforward language, whereas he composed an epic poem about Aristodemus.