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I don't have enough context to write an accurate overview of "303." The context provided only states "year," which doesn't tell me whether you're referring to a historical year, a book, a film, an event, a code, or something else entirely. Could you provide more details about what "303" refers to?
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Article
The Christian Martyrs' Last Prayer, by Jean-Léon Gérôme (1883)
Year 303 (CCCIII) was a common year starting on Friday of the Julian calendar. It was known in the Roman Empire as the Year of the Consulship of Diocletian and Maximian (or, less frequently, year 1056 Ab urbe condita). The denomination 303 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.