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I don't have enough context to write an accurate overview of "764." While you've indicated the context is "year," I cannot determine whether 764 refers to a specific historical year, an event that occurred in 764 CE, or something else entirely without additional information.
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Coat of arms of doge Maurizio Galbaio
Year 764 (DCCLXIV) was a leap year starting on Sunday of the Julian calendar, the 764th year of the Common Era (CE) and Anno Domini (AD) designations, the 764th year of the 1st millennium, the 64th year of the 8th century, and the 5th year of the 760s decade. The denomination 764 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.