HEODOTUS: Caesar: you are a stranger here, and not conversant with our laws. The kings and queens of Egypt may not marry except with their own royal blood. Ptolemy and Cleopatra are born king and consort just as they are born brother and sister.
BRITANNUS (shocked): Caesar: this is not proper.
THEODOTUS (outraged): How!
CAESAR (recovering his self-possession): Pardon him, Theodotus: he is a barbarian, and thinks that the customs of his tribe and island are the laws of nature.