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I don't have enough context to write an accurate overview of "233." You've only provided "year" as context, which doesn't clarify what specific thing called "233" you're referring to. Could you provide more information about what "233" is?
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Alemanni expansion (3rd century)
Year 233 (CCXXXIII) was a common year starting on Tuesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Claudius and Paternus (or, less frequently, year 986 Ab urbe condita). The denomination 233 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.