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I don't have sufficient context to write an accurate overview of "1623." The context provided only indicates it's a year, but without additional information about what specific event, work, person, or topic "1623" refers to, I cannot provide a reliable explanation of what it is and why it matters.
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August 6: The Battle of Stadtlohn takes place.
1623 (MDCXXIII) was a common year starting on Sunday of the Gregorian calendar and a common year starting on Wednesday of the Julian calendar, the 1623rd year of the Common Era (CE) and Anno Domini (AD) designations, the 623rd year of the 2nd millennium, the 23rd year of the 17th century, and the 4th year of the 1620s decade. As of the start of 1623, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.