Final answer:
In 31 AD, Antonia Minor informed Emperor Tiberius that Sejanus was plotting against him, reflecting the political intrigue of Tiberius' reign. Tiberius, known for his suspicion and paranoia, eventually retreated to Capri, distant from Rome but still executing those he considered threats.
Step-by-step explanation:
In 31 AD, Antonia Minor, the sister-in-law of Emperor Tiberius, informed him that Sejanus was plotting against him. This event is a part of the complex political intrigue that characterized Tiberius' reign, in which Sejanus, the Praetorian Prefect, sought to consolidate power and eliminate rivals. Plots and counterplots were common in the Roman political arena, as evidenced in the provided excerpts, with family members often being involved in schemes against each other. The Roman historian Tacitus provides a detailed account of Sejanus' conspiracy against Tiberius, and the subsequent downfall of Sejanus himself, which was a turning point in Tiberius' rule.
It is well-established in Roman history that Tiberius became increasingly paranoid and bitter, leading to various purges and executions as he sought to protect his position. His withdrawal to Capri further distanced him from the political machinations of Rome, but did not prevent him from exercising lethal control over perceived threats to his rule, including the punishment and execution of many nobles and senators.