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I don't have sufficient context to write an accurate overview of "420." The only context provided is "year," which doesn't give me the information needed to explain what 420 refers to or why it matters. Could you provide more context?
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Pharamond is lifted on the shield by the Franks, by Pierre Révoil, 1841, and Michel Philibert Genod, 1845
Year 420 (CDXX) was a leap year starting on Thursday of the Julian calendar. At the time, it was known as the Year of the Consulship of Theodosius and Constantius (or, less frequently, year 1173 Ab urbe condita). The denomination 420 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.