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I don't have sufficient context to provide an accurate overview of "504." The single word "year" doesn't clarify whether you're asking about a historical year, a law (like Section 504 of the Rehabilitation Act), a policy, an event, or something else entirely. Could you provide additional context about what "504" refers to?
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City of Copán during the Maya civilization
Year 504 (DIV) was a leap year starting on Thursday of the Julian calendar. At the time, it was known as the Year of the Consulship of Nicomachus without colleague (or, less frequently, year 1257 Ab urbe condita). The denomination 504 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.