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I don't have specific context about what "523" refers to. To write an accurate overview, I would need additional information about whether this refers to a year (523 AD/CE), a historical event, a scientific concept, a product, or something else entirely. Could you provide more details about what "523" is?
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Pope John I (523–526)
Year 523 (DXXIII) was a common year starting on Sunday of the Julian calendar. At the time, it was known as the Year of the Consulship of Maximus without colleague (or, less frequently, year 1276 Ab urbe condita). The denomination 523 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.