Octamasadas was a Scythian king, the son of King Ariapeithes (or Ariapifas), who lived around 446 BC. He came to power after he deposed and replaced his half-brother Scylas.[1] Octamasadas was the son of Teres I’s daughter, making Octamasadas Teres’ grandson.[2] Teres I was the father of Sitalces (431–424 BC) and Sparadocos (448–440 BC), Thracian kings.