Final answer:
Caligula's older brothers were imprisoned as threats to the emperor and died by starvation. During his reign, Caligula became notorious for cruel punishments and suspicion of treason, which led to his assassination.
Step-by-step explanation:
Caligula's older brothers were also put in prison for being threats to the emperor and starved themselves to death. Caligula, known for his cruel and sadistic nature, began to view those close to him as threats after recovering from a severe illness in 37 CE. This led to many being killed or exiled, including his brothers who were accused of plotting against him and subsequently imprisoned. His tyrannical reign, filled with treason trials and lethal suspicions, eventually led to a conspiracy resulting in Caligula's assassination by officers of the Praetorian Guard, senators, and other courtiers in 41 CE.