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I don't have enough context to write an accurate overview of "814." The word "814" could refer to many different things—a year, a numerical code, a location, a law or regulation, or something else entirely. To provide you with an accurate 2-sentence overview, I would need more specific information about what "814" refers to.
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Article
Europe at the death of Charlemagne (814) Emperor Louis I the Pious (778–840)
Year 814 (DCCCXIV) was a common year starting on Sunday of the Julian calendar, the 814th year of the Common Era (CE) and Anno Domini (AD) designations, the 814th year of the 1st millennium, the 14th year of the 9th century, and the 5th year of the 810s decade.