How One Murder and One Trial Broke Rome Forever - Ancient History

Hellenic Legacy
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2 Video Views·Jan 31, 2026
Kings and Generals' historical animated documentary series on the history of Rome continues with the new series on the reign of Augustus and his successors, in a series we call the Julio-Claudian dynasty
The success of Germanicus in Germania earned him a great deal of ire in Rome,
resulting in his withdrawal from the region. But why did his family and career bring him
head-to-head with the Emperor, whereas his father Drusus had been in Augustus' good graces?
We'll dive into that and more as we explore the downfall and death of Germanicus.
Welcome to our latest video on the history of the Julio-Claudian dynasty,
in which the dust settles over a period of long and bitter wars in Germania,
and one of Rome's greatest generals finds only bitterness and a worsening relationship
with his Emperor awaiting him as his reward for his military accomplishments.
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We'll have a link in the description! The first two years of Tiberius' reign were a rocky start,
with both a mutiny and Germanicus' defiance of Augustus' orders blemishing his image.
The tumult on the border was by no means exclusive, as in Rome, Tiberius' relationship
with the Senate was already showing its cracks. Factionalism within the Senate had remained since
the time of the Republic, even though the nature of those factions and their roles differed under
the new Princeps. The selection of Tiberius as successor had partially appeased one of these
two factions, that of the older senatorial families, from whom he drew most of his supporters
and allies in the Senate. These were the descendants of the Optimates, also known as
the Claudian faction. Their opponents, the Populares, had turned into the Julian faction,
that consisted primarily of newer families elevated to senatorial and consular status.
While these factions had grown accustomed to bowing their heads before the authority of Augustus
in the public forum, in the arena of private life they still held significant sway. Under Tiberius,
however, it would be the public forum where they suddenly found themselves butting heads with the
new Princeps. Tiberius was a man of Stoic philosophy, a believer in the rule of law,
the virtues of competent rule, and the primacy of the Senate. These seemingly positive qualities in
a dictator indeed brought many changes to the Roman government that strengthened the power of
Senate and curtailed the authority of the Princeps. However, Tiberius' sincerity often ignored his
reality, as he often failed to understand that his presence and wishes heavily influenced the
decisions of the Senate, a body now accustomed to following the direction of the Princeps for
two generations. When Tiberius did not state his views, believing genuinely in the ability of the
courts and Senate to operate with impartiality or in their own power, they often tried to deduce
what the Princeps' views were and rule accordingly, causing conflict. Tiberius expected both competence
from those who held office and for those offices to function as stated under Roman law, leaving him
short-tempered with sycophants or the Senate's deference to his wishes. Thus, Tiberius' interventions
in the Senate's actions were perceived as arbitrary and therefore tyrannical by both his contemporaries
and later authors. These public clashes were detrimental to Tiberius' image and Germanicus'
actions only worsened this perception. Foremost among Tiberius' discontent was Germanicus' own
incompetence in the handling of the mutiny of 14 CE. Germanicus had both overstepped his bounds
in promising concessions to the army of the Rhine and his failure to deliver those concessions once
they had been promised led to further unrest among the soldiers. Tiberius also had castigated Germanicus
for endangering his family and turning the army on itself, before ultimately being turned across
the Danube. This brought about Tiberius' second vexation with Germanicus, which was his willingness
to defy Augustus' wishes. For Tiberius, reverence for Augustus and his will was held in extremely
high regard. Tacitus and Suetonius both note in his Pietas, among other sources, both his own respect
for the recently deified emperor and his demand of others to exhibit the same reverence. Often,
however, this dissatisfaction with obeying the wishes of Augustus was used by Tiberius as a
cover for more serious offences, as shall be seen. Germanicus' return to Rome in early 17 CE was not
marked by any major political scandal or internal conflict. In fact, quite the opposite occurred,
as Germanicus was honoured with a triumph on the 26th of May. However, he would not stay long.
The Parthian emperor Venones was the son of Fratis IV and had been a hostage under the Romans
alongside his brothers in the years leading up to Augustus' death. After the death of
Herodes III in 6 CE, he had been appointed by Augustus and ruled briefly from 8 to 12 CE,
before he had been ousted by Artebanus II. Venones fled to Armenia, which had lacked a ruler after
the assassination of Artebanus III by Tigranes IV and Erato, who themselves were then overthrown,
and Venones seized the throne with Augustus' blessing in 12 CE. With Artebanus displeased
at this outcome and Venones himself under threat from unrest in Armenia, the governor of Syria,
a man named Quintus Caecilius Metellus Craticus Solanus recalled Venones to Syria,
where he was kept under kingly conditions. In addition, many of Rome's eastern provinces
were in the midst of unrest due to high taxes or tributes from client states.
Sending a member of the imperial family to handle the situation had proved effective and had become
the norm under Augustus, and the senate granted Germanicus pro consula imperium for all the
provinces on the other side of the Adriatic to take control of the situation. However,
Tiberius remained suspicious of Germanicus, who had ties to the governor of Syria via the marriage
of his daughter with Germanicus' eldest son Nero. Solanus had been in the province since 11 CE,
and for Tiberius to recall him aroused no suspicions. Instead, he sent a man named
Piso. Piso was a man of consular standing and looked down upon the sons of Tiberius,
convinced he had been appointed to specifically keep Germanicus in check.
In return, Germanicus resented Tiberius' continuous distrust, fermented by Piso's tactless
demeanor, further exacerbating the image of serious discord within the imperial family
in the eyes of the senate and the populace. At the beginning of 17 CE, Germanicus sailed to the
east, landing in Illyricum and proceeding south to Nicopolis near Actium, where he was elevated
to his second consulship. Founded by Augustus to celebrate his victory, being elevated to the
consulship in the city had a major influence on the public image of Germanicus, and this event
must have been done specifically at Tiberius' behest, probably to repair the perception of
discord between the emperor and his heir. Germanicus then proceeded to Athens, where he won
favor of the Athenians by parading with but one licta, only for Piso to arrive and begin
criticizing the heir of Tiberius and insulting the Athenians. Germanicus sailed to Lesbos where
his wife Agrippina gave birth, while Piso made straight for Rhodes and was nearly shipwrecked
in a storm, only to be saved by Germanicus. Still, this did not improve the relationship
between the two men, and the obstinate Piso arrived in Syria and immediately began replacing
officials and legionary officers with his own men. Piso handed out bribes, enabled corruption,
and allowed the discipline of the soldiers to become lax, securing the loyalty of the army
and putting himself in a dangerous position for Tiberius. Germanicus was aware of the
situation in Syria, but his duties in Armenia prevented him from addressing it immediately.
He sent Quintus Varanius to oversee the organization of Cappadocia as a province,
and Quintus Servaeus to organize Comeghini as part of Syria, while Germanicus himself
proceeded to Artaxata in Armenia. There, he appointed a man known to the Romans as Zeno,
who had become popular among the Armenians for his embracing of their culture, and Germanicus
himself placed the diadem upon Zeno's head as he was appointed their new king, Artaxias.
This resolution was likely orchestrated by Tiberius, and seemed to have pleased
Artabanus of Parthia as well. Germanicus had issued a dispatch to Piso in Syria to send a
detachment of troops as an honor guard for this occasion, which Piso had flat out ignored. The
two men agreed to a meeting at Chiras in Syria to resolve the dispute, but attitudes quickly soured
as Germanicus' friends hurled accusations at Piso, and Piso browbeat Germanicus despite being his
inferior. The men left as public enemies, and relations would only continue to deteriorate
from that point forward. Later, at a banquet in Nabatea, Piso threw a fit over the gifting of
luxurious gold crowns to Germanicus and Agrippina, which he saw as an obstinate display that flew in
the face of Roman virtue. Germanicus merely sat in silence, unable to accost Piso due to his
friendship with Tiberius, and the fact that Tiberius shared many of Piso's views. Despite
the strife in Syria, Germanicus continued making progress on Rome's eastern border.
Alongside securing the friendship of the Nabateans, Germanicus was invited to meet
on the Euphrates by Artabanus II of Parthia, who sought to resolve the situation with Venones.
Piso had kept Venones in a luxurious palace in Syria, having been enamored by Venones' gifts
to him and his wife Plankina. In turn, Piso had sought to continue to instigate trouble in Parthia,
intending to support Venones and his bid for the Parthian or Armenian thrones.
Artabanus II's request reached Germanicus, who saw it advantageous to partially acquiesce.
As such, Germanicus declined to meet, stating that it would only be proper for Artabanus to
parley with Tiberius himself, but informed Artabanus II that he would be removing Venones
from Syria and hosting him in Cilicia, lest to appease Artabanus so much as to spite Piso.
But then Germanicus made a grave error, travelling south to Egypt to conduct official business in
Alexandria, which he believed was part of his mandate. Germanicus entered the city wearing
Greek dress as he had at Athens and parading without most of his lictors and associates,
causing him to win widespread popularity. After first alleviating a local famine, Germanicus
went on a tour of the province and sailed down the Nile to Syene, where, upon preparing to turn back,
he finally received Tiberius' missive. Tiberius was seriously upset, as Germanicus had violated
Augustus' mandate that no senator should set foot in Egypt without the explicit permission of
the princeps. Tiberius' reverence for Augustus' will and the misunderstanding over the status of
Egypt as not just a province but also still the private estate of the princeps deepened the
mistrust and divide between Germanicus and Tiberius again. Having been effectively ordered to leave,
Germanicus received yet further bad news that while he had been away, Piso had undone all of
attempt to restore discipline in the Syrian legions and address the needs of the province's
government and cities. While sending letters back and forth as Germanicus returned home,
the young heir fell ill but recovered, only to relapse back into illness. Germanicus was convinced
he had been poisoned by Piso, formally renouncing his official friendship with Piso and ordering him
to leave Syria. Germanicus, lying on his deathbed, asked his associates to avenge his death and bring
Piso and Plankina to justice. Germanicus died somewhere en route to Antioch on the 10th of
October 19 CE, his last words being to his wife Agrippina, whom he asked to temper her lust for
the throne. The funeral was conducted in Antioch with little ceremony and the vacant governorship
fell to Cnaeus Centius Saturninus, one of Germanicus' associates. Agrippina and Germanicus'
friends Vitellius and Veranius then set sail for Rome, already having arrested a notorious
poisoner named Martina to make their case against Piso and Plankina. Meanwhile, Piso's friend
Domitius Keller and a cadre of centurions had come to the island of Kos, where he had fled
and persuaded Piso to attempt to regain his governorship. Piso sailed back to Syria against
his better judgment and took command of a force of deserters, new recruits, and some Cilician
auxiliary regiments, while Domitius went ahead to try and persuade Legio VI Verrata to join them.
Centius quickly dismantled Piso's attempt to reassert control and shipped Piso to Rome to
await trial. By the time news reached Rome of Germanicus' illness, rumours immediately began
circulating that Tiberius and Livia had been involved in the affair, as the public's perception
of internal discord seriously damaged Tiberius' position. Tiberius and Livia's refusal to attend
the procession back to Rome and then their denial of a state funeral only exacerbated the public's
resentment. In reality, Tiberius and Livia simply knew that nothing good could come of
showing their faces before the public at the procession or funeral, as the populace had
already made up its mind about their involvement and donning a mask would have only brought
accusations of hypocrisy. Tiberius now had to navigate the waters of an extremely public trial
and a troubled future for his reign. The trial was already off to a bad start when the poisoner
killed herself upon landing at Brundisium, to which the public immediately cried foul play.
Piso sent his son Marcus ahead to Rome, who was received impartially by Tiberius,
granting him the customary waiving of his expenses by the state,
while Tiberius had recalled his son Drusus from Illyricum, where he had been learning military
command with allegiance. Meanwhile, Piso landed at Ancona and entered the city with his entourage
to much pomp, hosting a party in his lavishly decorated house overlooking the forum,
enraging the mob. Fulcinius Trio, who had been the prosecutor in the trial of Libo three years
before in 16 CE, brought forth charges against Piso, but Germanicus' associates Vitellius and
Veranius intervened, taking up the prosecution themselves. Tiberius was asked to preside over
the case, as the consuls wanted little to do with such a public trial or the consequences of the
ruling, but Tiberius refused, knowing that if Piso were found innocent or acquitted,
then the public's accusations that the princeps himself was involved would be validated.
Tiberius did give a speech at the beginning of the case, asking the senate both to ignore
irrelevant accusations about Piso's character and private affairs and focus on the real charges,
that of murder and sedition or treason based on his conduct in Syria. He also requested that the
senate avoid being influenced by either his own person or the public's accusations when deciding
the case. Two days were given to the prosecution to make their case. Then, after a recess of six
days, the defendants would be given three days to make their arguments. Vitellius and Veranius
brought forward serious accusations, arguing that Piso had bribed or won over the worst elements in
the Syrian legions and government to incite a rebellion after murdering Germanicus with a mix
of poison and magic. The defense's position was incredibly weak. Piso had ordered the interruption
of sacrifices to Germanicus' health while he was ill, and he had indeed incited a brief civil war
in Syria in a bid to regain his post after Germanicus' death, having had to be defeated
in battle before he could be brought to trial. Piso's defendants were his brother, Lucius
Calpurnius Piso, Marcus Aemilius Lepidus, and Livinaeus Regulus. This defense council focused
on refuting the charge of murder, on which Tacitus states the prosecution's story was so outrageous
that it was unbelievable. Unfortunately for Piso, a mix of popular hysteria and political motivations
biased the Senate severely, and his advocates had no hope of cutting through it to make them see
reason. The only alternative to a guilty verdict was the rioting mob outside, who tore down Piso's
statues in their clamor for a lynching. Piso was escorted home under the protection of the Praetorians,
where he found Plankina had abandoned him and thrown herself before the mercy of Livia.
While he still had the support of his sons, Piso returned to the court for the next day of the
defense, but with the Senate unwilling to listen, he returned home that night and was found dead
the next morning, having cut his own throat. The outcome of the trial only spurred further
conflict between Tiberius and the Senate. Plankina's trial had been swift, and she was acquitted by
Tiberius specifically at Livia's request. Piso's sons, Marcus and Gnaeus, were also exonerated,
as Marcus opposed his father's insurrection before being forced to follow him to Syria,
and Gnaeus was in Rome the entire time. The Senate, however, was out for blood. The Senator,
Cotta Messalina, demanded that Piso's name be struck from the fasti, and his estate confiscated.
Furthermore, he demanded that Gnaeus change his prenomen, that Marcus be exiled for a decade,
and that it specifically be recorded that Plankina was spared at the instigation of
Livia. This was a direct insult to Tiberius, who refused all of these demands. Instead,
a proclamation thanking the princeps and his heir's families for their role in avenging Germanicus was
decreed, and the prosecutors were awarded priesthoods and Tiberius' support in their future
careers. Just days later, on May 28th, Drusus celebrated his ovation as the new heir apparent
to Tiberius. Ultimately, Piso's trial brought Tiberius' internal struggle to the forefront.
Whereas Tiberius somewhat still believed in republicanism, his friend Piso, in his callous,
blunt, and tactless manner, had acted not only in his earnest belief in it, but as if it still
functioned. Meanwhile, Tiberius had been forced to play politics to keep his ambiguous relationship
with Germanicus intact, and was now confronted with the consequences of his decisions in lying
to himself and behaving hypocritically in his veneration for Augustus and preserving those
mandates and dictates. As Tiberius' conflict with the senate escalated, and his desire to
be rid of the affairs of state once more came to the forefront, new men would enter the political
arena and power in Rome would be reshaped with fear. Next time, we'll introduce Sejanus and
see Tiberius the tyrant on full display, as his treason trials shake the senate and Rome to its
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