Under whose leadership did the Germans defeat the Romans in 9 AD in the Teutoburg Forest?

Arminius was a chieftain of the Germanic Cherusci tribe who famously led an allied coalition of Germanic tribes to a decisive victory against three Roman legions in the Battle of the Teutoburg Forest in 9 AD. An auxiliary lieutenant to the Roman general Publius Quinctilius Varus, Arminius used his knowledge of Roman tactics to ambush and destroy the legions.