CIL 02, 00172 (Q11730)

Oath of the Aritiensians. It is in accordance with my soul and conscience that I will be an enemy of those who I come to learn are enemies of Gaius Caesar Germanicus, and if anyone attempts or has attempted to endanger him or his safety, I will not cease from pursuing him with armed might in a war without mercy on land and sea until he has paid the penalty. I will not hold myself or my children more precious than his safety. I will treat as my enemy those who have hostile intentions against him (...)