was the older brother of Arminius
. Both entered services with the Roman Empire
serving as German
auxiliaries during the Pannonia
uprising. Flavus remained loyal to Rome during the rebellion raised by Arminius and the subsequent Battle of the Teutoburg Forest
. He participated in the punitive expedition sent by Tiberius
against Arminius in AD 14-16.
Flavus wholeheartedly embraced Romanization, unlike his brother Arminius. However, he was unaware of his brother's true feelings and so was unable to anticipate his rebellion and the subsequent Battle of the Teutoburg Forest.