Final answer:
Metellus Cimber asked Julius Caesar to pardon his exiled brother, beginning the events that led to Caesar's assassination.
Step-by-step explanation:
On the day of Caesar's assassination, Metellus Cimber approached Julius Caesar under the pretense of petitioning for his exiled brother's return. This act was a ruse coordinated by the conspirators to surround Caesar and prevent his escape. Metellus was one of several senators involved in the assassination plot, and his request was meant to initiate the sequence of events that led to Caesar being stabbed 23 times by his fellow senators, leading to his death.