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I don't have sufficient context to write an accurate overview of "304." The context provided only indicates it's related to a year, but doesn't specify what "304" refers to (such as a historical event, legislation, product, or other subject matter). Could you provide more details about what "304" specifically is?
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Saint Vincent of Saragossa
Year 304 (CCCIV) was a leap year starting on Saturday 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 1057 Ab urbe condita). The denomination 304 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.