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I don't have enough context to write an accurate overview of "100." The context provided only indicates the word "year," which is insufficient to determine what "100" refers to (a book, film, event, number system, historical period, etc.) or why it would matter. Could you provide more specific information about what "100" is?
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The eastern hemisphere in AD 100 The world in AD 100
100 (C) was a leap year starting on Wednesday of the Julian calendar, the 100th year of the Common Era (CE) and Anno Domini (AD) designations, the 100th year of the 1st millennium, the 100th and last year of the 1st century, and the 1st year of the 100s decade. As of the start of 100, the Gregorian calendar was 2 days behind the Julian calendar, which was the dominant calendar of the time.