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I don't have enough context to provide an accurate overview of "1604." The word "year" alone doesn't tell me whether you're asking about a historical event, a book, a film, a battle, or something else that occurred in or is titled "1604." Could you provide more details about what "1604" refers to?
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Article
August 28: The Treaty of London concludes the Anglo-Spanish War
1604 (MDCIV) was a leap year starting on Thursday of the Gregorian calendar and a leap year starting on Sunday of the Julian calendar, the 1604th year of the Common Era (CE) and Anno Domini (AD) designations, the 604th year of the 2nd millennium, the 4th year of the 17th century, and the 5th year of the 1600s decade. As of the start of 1604, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.