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I must clarify that there is no widely recorded historical event in 1556 CE where Mysore gained independence. The Kingdom of Mysore, located in southern India, was established much later, with its rise to prominence occurring in the 17th and 18th centuries under the Wodeyar dynasty. The region was part of the Vijayanagara Empire in the 16th century, and after the empire's decline in 1565 following the Battle of Talikota, various smaller states, including Mysore, began to assert their autonomy.
If you are referring to a specific event or lesser-known historical detail, I would need more context to provide accurate information. Let me know if you'd like to explore the broader history of Mysore or its eventual rise as a significant regional power!