The Coronation of Shivaji Maharaj took place in 1674 A.D. at Raigad Fort. This event marked the formal coronation of Shivaji as the King of the Maratha Kingdom, and he was crowned as "Chhatrapati" in a grand ceremony. The event was significant because it solidified his position as the ruler of the Maratha Empire and was a testament to his military and political achievements.
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Final Answer: 1674 A.D.