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I don't have sufficient context to write an accurate overview of "828." While you've indicated it relates to a year, I would need more specific information about what "828" refers to (such as a historical event, cultural significance, or other notable occurrence) to provide an accurate and meaningful explanation for a general reader.
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Article
One of the oldest known dated Sanskrit manuscripts from South Asia, this specimen transmits a substantial portion of Pārameśvaratantra, a scripture of the Shaiva Siddhanta, that taught the worship of Shiva as Pārameśvara ("Supreme Lord"). A note in the manuscript states that it was copied in the year 252, which some scholars judge to be of the era established by the Nepalese king Amśuvaran, therefore corresponding to 828 CE. Cambridge University Library
Year 828 (DCCCXXVIII) was a leap year starting on Wednesday of the Julian calendar.