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I don't have sufficient context to write an accurate overview of "491." The only information provided is the word "year," which doesn't clarify what "491" refers to (a historical year, a book, a law, etc.). Could you provide more details about what "491" is?
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Emperor Anastasius I (491–518)
Year 491 (CDXCI) was a common year starting on Tuesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Olybrius without colleague (or, less frequently, year 1244 Ab urbe condita). The denomination 491 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.