Octamasadas (Scythian *Uxtamazatā; Ancient Greek: Ὀκταμασάδης, romanized: Oktamasadēs; Latin: Octamasades) was a Scythian king, the son of King Ariapeithes, who lived around 446 BC.
The name (Ancient Greek: Ὀκταμασάδης, romanized: Oktamasadēs) is the Hellenisation of the Scythian language name *Uxtamazatā, meaning "possessing greatness through his words.
When Octamasadas arrived at the river Ister, the Thracian army was waiting for him.
The two sides were about to engage in battle when Sitalces sent a message to Octamasadas by a herald.
[4] After the exchange, Sitalces left with his brother, while Octamasadas beheaded Scyles as soon as he received him.