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I don't have sufficient context to write an accurate overview of "1584." The context provided only indicates it's a year, but doesn't explain what specific historical event, literary work, person, or other subject matter associated with 1584 you're asking about. Could you provide more details about what "1584" refers to?
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July 10: Willem van Oranje, leader of the Dutch Republic, is assassinated by gunman
1584 (MDLXXXIV) was a leap year starting on Sunday of the Gregorian calendar and a leap year starting on Wednesday of the Julian calendar, the 1584th year of the Common Era (CE) and Anno Domini (AD) designations, the 584th year of the 2nd millennium, the 84th year of the 16th century, and the 5th year of the 1580s decade. As of the start of 1584, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.