A person who hellenizes, or who works to spread or promote Greek language, culture, and customs to non-Greek peoples.
From hellenize plus -er (one who does). The noun form allows identification of agents actively involved in spreading Greek culture.
Alexander the Great was history's most successful hellenizer—he convinced the Persian empire to speak Greek, dress Greek, and think Greek in just a decade. His hellenizers (generals and administrators) built new cities that became centers of Greek learning across Asia.
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