Conditions begin to change, however, during the disastrous reign of Sultan Agung's son, Amangkurat I (r. 1646-77), who lacks his father's talents but seeks to further strengthen the realm by centralizing authority, monopolizing control of resources, and destroying all real or imagined opposition.

His misguided efforts to control trade revenues by twice closing the ports of the Pasisir, and even destroying Javanese trading vessels and forbidding Javanese travel overseas, have the opposite effect, in addition to alienating the commercial community and damaging the wider economy of producers.

His obsessive fear of opposition leads him to kill more than five thousand Muslim leaders and their families in a single, well-planned massacre, and to murder hundreds of court officials and members of the aristocracy, including his own family, actions that of course only increase the hatred and intrigues aimed at removing him.

His attitude toward the VOC is ambivalent, for, on the one hand, he admires its apparent wealth and power and considers it a potential ally and protector, yet on the other hand he seeks to bend it to his will and to extract all he can from its representatives in Batavia.

Beginning in the early 1670s, rebellions begin to rise, the most powerful of which is led by Raden Trunajaya (ca. 1649-80), a Madurese aristocrat conspiring with a disaffected son of Amangkurat I and allied with Makassarese and other forces.

Trunajaya's armies win a decisive victory in 1676 and loot the capital the following year.

Mataram is disintegrating.