Gnaeus Calpurnius Piso (consul 7 BC)

Between that office and being appointed quaestor, which enabled him entry into the Roman Senate, Syme infers Piso was married.

Syme fills the gap between those events and his consulate with various activities, such as accompanying his friend Claudius Nero in his Alpine campaign.

In AD 17, heir designate Germanicus was given command of the eastern portion of the empire and Piso was appointed as his legate, and made governor of Syria.

Tacitus suggests that Piso was appointed to act as a check on Germanicus, and that he was given secret instructions by Tiberius to thwart his efforts and control him.

[11] In the summer of 19, Germanicus had left to take care of matters in Egypt, and when he returned he found that Piso had ignored his orders to the cities and the legions.

The armed attempt by Piso to regain control of Syria immediately after the death of Germanicus only aroused more indignation.

Tiberius was forced to order an investigation, and after briefly hearing both sides, decided to defer the case to the senate.

Additionally, the senate instructed the curatores locorum publicorum iudicandorum to remove and destroy structures built above Porta Fontinalis to connect his properties.

[19] A recently discovered senate resolution also confirms that Munatia Plancina owed her impunity to the recommendation of Tiberius, who had been pressed by Livia to act in this way.

[15][note 1] Piso was recorded as a man of violent temper, without an idea of obedience, and natural arrogance who saw himself as superior to the children of Tiberius.

[11] Tacitus further alleged that Piso's marriage to Plancina, a woman of noble rank and wealth, only inflamed his ambition.

Piso, suspecting murder, accused the legionary and sentenced him to death without offering him time to search for the missing soldier.

Fortunately for the legionary, before the centurion could swing the sword, the missing soldier walked into the camp and the execution was stopped.