Emily Dickinson Lexicon

Caesar (-s), proper n. [L. < a caeso matric utere, from the incised womb (caesarian section) < caesaries, head of hair; see czar.]

1. Gaius Julius Cæsar (100-44 B.C.); title character of Shakespeare's Julius Caesar [see ED letters]; [fig.] Austin Dickinson; older brother; family authority (ED sent this poem to her brother Austin).
2. Roman emperor; [fig.] ruler; powerful leader; grand person; (see Matthew 22:17).