Eurysthenes (Greek:Εὐρυσθένης; c. 400 BC) was a descendant of the Spartan kingDemaratus.
After his deposition in 491 BC, Demaratus had fled toPersia, where kingDarius I made him ruler of the cities ofPergamon,Teuthrania andHalisarna. About a hundred years later Eurysthenes and his brotherProcles reigned over the same cities; their joint rule is at least attested for the year 399 BC.[1]