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Parashurama
The axe-bearing brahmin warrior who humbles the kshatriya kings; Kerala and Konkan tradition credit him with raising the coast from the sea, and the Kerala Mahatmyam has him consecrate the Padmanabhaswamy image.
Sources: Dashavatara — Wikipedia; Onam — Wikipedia; Padmanabhaswamy Temple — Wikipedia · see Parashurama's web