Question

Meaning? ....from Julius Caesar. "Have I in conquest stretch'd mine arm so far

Answer 1

In these lines Caesar actually is scolding his wife Calpurnia for telling Decius Brutus to inform the senators Caesar's decision of not attending the proceedings at the Capitol. She asks Brutus to tell the senators Caesar is sick. Hearing this Caesar gets angry. He reminds Calpurnia and Decius Brutus that he has won so many wars against the mightiest of kings and generals. He does not want to give any excuse for his decision to stay back at home. He just instructs Decius Brutus to tell the senators that Caesar has decided not to attend the senate. He feels he is too powerful and important to give anyone any explanation for his decisions. 

Answer 2

The whole line should be read to understand the meaning...
"Have I in conquest stretch'd mine arm so far, To be afraid to tell graybeards the truth?"

Meaning- Have I got so many victories from even distant kingdoms to be fearful to tell the truth to the senators that he didn't want to come to the senate......

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