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नाभिषेको न संस्कारः सिंहस्य क्रियते वने ।
विक्रमार्जितसत्त्वस्य स्वयमेव मृगेंद्रता ॥

There is no official coronation ceremony held or any rituals performed to declare that Lion is the king of jungle. He becomes king by his own attributes and prowess.