Hamengkubuwana IV, also spelled Hamengkubuwono IV (1804 – 1828) was the fourth sultan of Yogyakarta, Indonesia, reigning from April 3, 1814 - December 6, 1822, and then from August 17, 1826 - January 2, 1828.

His reign was a period of political deterioration that ultimately led up to the Java War

Java War

The Java War or Diponegoro War was fought in Java between 1825 and 1830. It started as a rebellion led by Prince Diponegoro. The proximate cause was the Dutch decision to build a road across a piece of his property that contained his parents' tomb...

. Upon his premature death, rumours circulated that he had been poisoned. His three-year-old son, Hamengkubuwana V

Hamengkubuwana V

Hamengkubuwana V Hamengkubuwana V Hamengkubuwana V (also spelled Hamengkubuwono V, 1820 - 1855 was the fifth sultan of Yogyakarta, reigning from December 19, 1823 - August 17, 1826, and then from January 17, 1826 - June 5, 1855 being interspersed by the rule of Hamengkubuwana IV.-Notes:...

, ascended the throne amid controversy over who would act as regent.