Octamasadas (Scythian *Uxtamazatā; Ancient Greek: Ὀκταμασάδης, romanized: Oktamasadēs; Latin: Octamasades) was a Scythian king, the son of King Ariapeithes, who lived around 446 BC. He came to power after he deposed and replaced his half-brother Scyles.[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 Sparadocus (448–440 BC), Thracian kings.