Which historical figure was in conflict with Calpurnius Piso?

The correct answer is Germanicus, who was a prominent Roman general and a member of the Julio-Claudian dynasty. He was known for his military campaigns in Germania and for being the adopted son of Tiberius. The conflict between Germanicus and Calpurnius Piso was significant during the early 1st century AD, particularly regarding the governance of the eastern provinces of the Roman Empire.

Germanicus was sent to the eastern provinces to restore order and reinforce Roman authority, while Calpurnius Piso was appointed as the governor of Syria. Their relationship deteriorated due to Piso's actions, which were perceived as undermining Germanicus's authority and loyalty. Piso's governing methods were controversial and frequently resulted in tensions between him and Germanicus, leading to accusations of treachery. This conflict ultimately contributed to the tragic downfall and death of Germanicus, which was surrounded by allegations of foul play.

In this context, understanding the dynamics between these figures is vital for grasping the complexities of Roman political life during this period. The other figures listed did not have a direct, conflictual relationship with Piso like Germanicus did.