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I don't have enough context to provide an accurate overview of "509." The word "509" could refer to many things (a year, a law, a code, a location, etc.), and you've only provided "year" as context, which isn't specific enough. Could you clarify what aspect of 509 you'd like me to explain?
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Article
King Clovis I by François-Louis Dejuinne (1835)
Year 509 (DIX) was a common year starting on Thursday of the Julian calendar. At the time, it was known as the Year of the Consulship of Inportunus without colleague (or, less frequently, year 1262 Ab urbe condita). The denomination 509 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.