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I don't have enough context to provide an accurate overview of "312." The term "312" could refer to many things (a year, a road, a building code, a film, etc.), and you've only indicated it relates to "year," which is unclear. Could you provide more specific context about what "312" refers to?
AI-generated from the Wikipedia summary — may contain errors.
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Battle of the Milvian Bridge (312)
Year 312 (CCCXII) was a leap year starting on Tuesday of the Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Constantinus and Licinianus (or, less frequently, year 1065 Ab urbe condita). The denomination 312 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.