## Zero article before emperor in "You will not be emperor"

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Emperor is a countable noun according to the Cambridge dictionary. Why the zero article is used in the following sentence?

You will not be emperor. (Gladiator)


Comparing to the similar construction in which the definite article is used

You will be a god-king. (300 Rise of Empire)


possible duplicate of The definite article "the" was missing

– user3169 – 2015-03-01T16:43:37.410