Question: What was political office did Gaius Silius hold and was considered the highest elected political office of the Roman Republic?

full_context: Document 1: Battle of the Teutoburg Forest: The Battle of the Teutoburg Forest (German: "Schlacht im Teutoburger Wald" , "Hermannsschlacht", or "Varusschlacht"), described as the Varian Disaster ("Clades Variana") by Roman historians, took place in the Teutoburg Forest in 9 CE, when an alliance of Germanic tribes ambushed and decisively destroyed three Roman legions and their auxiliaries, led by Publius Quinctilius Varus. The anti-Roman alliance was led by Arminius, a Germanic officer of Varus' auxilia who had acquired Roman citizenship and had received a Roman military education, thus enabling him to deceive the Roman commander methodically and anticipate the Roman army's tactical responses.
Document 2: Gaius Silius (consul designatus 49 AD): Gaius Silius (c. AD 13 – 48) was a Roman senator who was nominated as consul designate for 49 AD, but was executed by the emperor Claudius for his affair with the empress Valeria Messalina.
Document 3: Publius Quinctilius Varus: Publius Quinctilius Varus (46 BC Cremona, Roman Republic – Sept. 9 AD near Kalkriese, Germany) was a Roman general and politician under the first Roman emperor Augustus. Varus is generally remembered for having lost three Roman legions when ambushed by Germanic tribes led by Arminius in the Battle of the Teutoburg Forest, whereupon he took his own life.
Document 4: Senate of the Roman Republic: The Senate of the Roman Republic was a political institution in the ancient Roman Republic. It was not an elected body, but one whose members were appointed by the consuls, and later by the censors. After a Roman magistrate served his term in office, it usually was followed with automatic appointment to the Senate. According to the Greek historian Polybius, our principal source on the Constitution of the Roman Republic, the Roman Senate was the predominant branch of government. Polybius noted that it was the "consuls" (the highest-ranking of the regular magistrates) who led the armies and the civil government in Rome, and it was the "Roman assemblies" which had the ultimate authority over elections, legislation, and criminal trials. However, since the Senate controlled money, administration, and the details of foreign policy, it had the most control over day-to-day life. The power and authority of the Senate derived from precedent, the high caliber and prestige of the senators, and the Senate's unbroken lineage, which dated back to the founding of the Republic in 509 BC.
Document 5: List of Roman consuls designate: This is a list of Roman consuls designate, individuals who were either elected or nominated to the highest elected political office of the Roman Republic, or a high office of the Empire, but who for some reason did not enter office at the beginning of the year, either through death, disgrace, or due to changes in imperial administration.
Document 6: List of undated Roman consuls: This is a list of Roman consuls, individuals who were either elected or nominated to the highest elected political office of the Roman Republic, or a high office of the Empire, but for whom an exact date of when they served in office is absent. Most are reckoned to be suffect consuls, but occasionally it encompasses an ordinary consul.
Document 7: Gaius Silius: Gaius Silius (died AD 24) was a Roman senator who achieved successes as a general over German barbarians following the disaster of the Battle of the Teutoburg Forest. He had been appointed consul in AD 13. However, Silius became entangled in the aftermath of Sejanus' fall and was forced to commit suicide.
Document 8: Quaestor: A quaestor ( , , ) was a public official in Ancient Rome. The position served different functions depending on the period. In the Roman Kingdom, "quaestores parricidii " (quaestors with judicial powers) were appointed by the king to investigate and handle murders. In the Roman Republic, quaestors (also pluralized "quaestores ") were elected officials that supervised the state treasury and conducted audits. It was the lowest ranking position in the "cursus honorum " (course of offices). However, this means that in the political environment of Rome, it was quite common for many aspiring politicians to take the position of quaestor as an early rung on the political ladder. In the Roman Empire, the position, which was initially replaced by the "praefectus " (prefect), reemerged during the late empire as "quaestor intra Palatium ", a position appointed by the emperor to lead the imperial council and respond to petitioners.
Document 9: Gaius Julius Vindex: Gaius Julius Vindex (born ca. AD 25; died AD 68), of a noble Gaulish family of Aquitania given senatorial status under Claudius, was a Roman governor in the province of Gallia Lugdunensis. In either late 67 or early 68, he rebelled against Emperor Nero. Though the aims of his followers may be more complex, Vindex as a senator would have had the aim simply of replacing Nero with a better emperor. According to the historian Cassius Dio, Vindex "was powerful in body and of shrewd intelligence, was skilled in warfare and full of daring for any great enterprise; and he had a passionate love of freedom and a vast ambition" (Cassius Dio, 63.22.1-2). In order to gain support, he declared his allegiance to the then governor of Hispania Tarraconensis, Servius Sulpicius Galba, as the new emperor but the commander of the Germania Superior army, Lucius Verginius Rufus advanced against him. The battle between their two forces took place near Vesontio (modern Besançon). What occurred then is unclear but despite a meeting between Verginius and Vindex, the forces under Verginius seemed to have decided on a battle without orders. Desire for plunder and the weakness of Verginius as a commander are possible explanations. In the resulting battle Vindex was defeated and committed suicide.
Document 10: Marcus Horatius Pulvillus: Marcus Horatius Pulvillus was an aristocrat before and during the early Roman Republic at the time of the overthrow of the Roman monarchy. He was a suffect consul in 509 BC and elected again in 507 BC, according to the Varronian chronology.
Document 11: Arminius: Arminius (German: "Hermann"; 18/17 BC – AD 21) was a chieftain of the Germanic Cherusci tribe who famously led an allied coalition of Germanic tribes to a decisive victory against three Roman legions in the Battle of the Teutoburg Forest in 9 AD. An auxiliary lieutenant to the Roman general Publius Quinctilius Varus, Arminius used his knowledge of Roman tactics to ambush and destroy the legions.
Document 12: Sulla: Lucius Cornelius Sulla Felix ( ; c. 138 BC – 78 BC), known commonly as Sulla, was a Roman general and statesman. He had the distinction of holding the office of consul twice, as well as reviving the dictatorship. Sulla was a skillful general, achieving numerous successes in wars against different opponents, both foreign and Roman. He was awarded a grass crown, the most prestigious Roman military honor, during the Social War.
Document 13: Aulus Cremutius Cordus: Aulus Cremutius Cordus (died 25 AD) was a Roman historian. There are very few remaining fragments of his work, principally covering the civil war and the reign of Augustus Caesar. In 25 AD he was forced by Sejanus, who was praetorian prefect under Tiberius, to take his life after being accused of "maiestas (treason)". He had been accused by Satrius Secundus of having eulogized Brutus and spoken of Cassius as the last of the Romans, which was considered an offence under the "lex majestatis," and the senate ordered the burning of his writings. Seneca the Younger, however, tells us that he most likely incurred Sejanus' displeasure for criticising him, because Sejanus had commissioned a statue of himself. We also know from this source—a letter to Cordus' daughter Marcia—that he starved himself to death. She was also instrumental in saving his work, so that it could be published again under Caligula. Apart from Seneca, he is mentioned by Tacitus, Quintilian, Suetonius and Dio Cassius. Even though Cordus committed suicide, his work survived, prompting Tacitus to deride "the stupidity of people who believe that today's authority can destroy tomorrow's memories."
Document 14: Roman consul: A consul was the highest elected political office of the Roman Republic, and the consulship was considered the highest level of the "cursus honorum" (an ascending sequence of public offices to which politicians aspired).
Document 15: Gaius Marcius Figulus (consul 162 BC): Caius Marcius Figulus was a politician of the Roman Republic who served as praetor in 169 BC, Roman consul in 162 BC, and again as consul in 156 BC. Upon being elected to the praetorship in 169 BC, Figulus received command of the Roman fleets by lot. Later that year, he transported the consul, Quintus Marcius Philippus, to Ambracia so that he could assume command of Roman forces fighting the Third Macedonian War. Figulus himself sailed on to Creusa, then crossed Boeotia by land in a single day to join the rest of the fleet at Chalcis. The only other mention Livy makes of Figulus is a reference to his having assigned part of the fleet to winter quarters at Sciathus, and the remainder at Oreum, in Euboea, which he judged the best location to maintain supply lines to the army in Macedon.
ground_truth: consul