Sinnion (Greek: Σιννίων or Σισίννιος; undetermined origin, perhaps Iranian[1]) was the chieftain of the Kutrigurs, a Turkic nomadic tribe of the Pontic–Caspian steppe.
[2][3] Noted for their strength and bravery,[3] Sinnion and Balas led a group of 600 auxiliaries (all mounted archers),[1] at the Battle of Ad Decimum (September 13, 533).
After the Utigurs led by Sandilch had attacked the Kutrigurs, Sinnion succeeded Chinialon as leader of the Kutrigurs between 551 and 558.
[4] Having suffered great losses, the Kutrigurs made a peace treaty with Byzantine Empire, and 2000 Kutrigurs with their wives and children were led by Sinnion into the Empire's service and were settled in Thrace.
[4][2] The shelter provided to the Kutrigurs was not well received by Sandilch.