The king of Kediri Kingdom in East Java, Kertajaya thought himself as a deity, and he was opposed by the Brahmana (priests) caste. When he threated the Brahmanas, they ran to Tumapel and asked the ruler, Ken Arok, for his protection. Ken Arok thought that Kediri army would attack his territory, and ordered his troops to fortify.
Kediri army came to Tumapel as Arok was expecting. The Battle of Ganter, in 1222, was the end of Kediri Kingdom, then Ken Arok formed his own empire, Singosari.
Ken Arok proclaimed himself as the son of Shiva.
Historians has been argued on Ken Arok's new dynasty because his origin wasn't clear . Who is he? Why he could forma kingdom? Does he have a dark past?
After Kertajaya lost, the Kediri Kingdom was ruled by Tunggul Ametung. He had a very beautiful wife, Ken Dedes. A statue in Leiden Museum, Netherlands, shows Ken Dedes as Prajnaparamitha, Goddess of Wise.
One day Ken Arok accidentaly saw Ken Dedes, then a wind hiked her gown. Suddenly Ken Arok got a vision, that he had to have Ken Dedes as his wife, at any risk.
Ken Arok decided to kill Tunggul Ametung.
He ordered a "keris" (a sacred short sword) to a priest, Mpu Gandring. It took a long time to make a "keris" because only englighted priest could make it, and they had to do some rituals for that.
Ken Arok was impatient to wait the keris to be done. His lust to Ken Dedes is getting bigger and bigger. He came up to Mpu Gandring to ask if the keris was completed. When Mpu Gandrig said no, Ken Arok kill him with that incompleted keris.
Before he died, Mpu Gandring cursed the keris.
Later, Ken Arok lent the keris to Kebo Ijo, a petty criminal Kebo Ijo was so proud. that he showed the keris to everyone. At night, Ken Arok stole the keris again, and he succesfully kill Tunggul Ametung. Kebo Ijo was framed as the killer, but before he could talk, Ken Arok killed him with the keris.
In the 5th year of his reign, a man called Anusapati wanted the throne of Singosari from Ken Arok. Ken Arok had abandoned Mpu Gandring's keris but Anusapati killed him with that.
Ken Arok had a concubine named Ken Umang, and their son, Tohjaya decided the revenge.
At the 21th year of Anusapati's rule, Tohjaya invited Anusapati for gambling, and when Anusapati was having fun, Tohjaya killed Anusapati, again with Mpu Gandring's keris.
After Anusapati's death, his son Ranggawuni wanted the throne. Tohjaya sent Lembu Ampal to attack Ranggawuni and his companion, Mahesa Cempaka. Lembu Ampal realized that Ranggawuni was the right person to be the king, and they fought against Tohjaya. Tohjaya was killed with Mpu Gandring's keris.
Ranggawuni and Mahesa Cempaka realized that Mpu Gandring's keris would only make chaos and death, so they threw the keris to the Java Sea. Legend said that the keris turned to be a dragon.