The beauty of Ken Dedes, Tunggul Ametung's wife, became the cause of his death by the hand of Ken Arok.

Tunggul Ametung was the chief of Tumapel area, East Java, Indonesia, which, at the time, was a part of the Kingdom of Kediri under the reign of King Kertajaya (1185 - 1222). He was famous for being the first victim of the cursed keris of Mpu Gandring. One of his bodyguard, Ken Arok, killed him with the keris, after he accidentally saw his beautiful wife, Ken Dedes, and fell in love with her. The story of his death is featured in The Legend of the Keris of Mpu Gandring.