He appointed to it Cneius Piso, a man of violent temper, without an idea of obedience, with indeed a natural arrogance inherited from his father
Ann Book II Chapter 43: Germanicus goes East. Preparations.

When he reached Syria and the legions, he began, by bribery and favouritism, to encourage the lowest of the common soldiers, removing the old centurions and the strict tribunes and assigning their places to creatures of his own or to the vilest of the men, while he allowed idleness in the camp, licentiousness in the towns, and the soldiers to roam through the country and take their pleasure.
Ann Book II Chapter 55: Germanicus goes East. Piso too.

Piso was at the island of Cos when tidings reached him that Germanicus was dead. He received the news with extravagant joy, slew victims, visited the temples, with no moderation in his transports
Ann Book II Chapter 74: Martina sent to Rome.