Jisho

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紀元前31年
Wikipedia definition
1. 31 BCYear 31 BC was either a common year starting on Tuesday, Wednesday or Thursday or a leap year starting on Tuesday or Wednesday (link will display the full calendar) of the Julian calendar (the sources differ, see leap year error for further information) and a common year starting on Tuesday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Antonius and Octavianus (or, less frequently, year 723 Ab urbe condita).
Read “31 BC” on English Wikipedia
Read “紀元前31年” on Japanese Wikipedia
Read “31 BC” on DBpedia

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