Third Javanese War of Succession

The Third Javanese War of Succession, also known as the Gianti Agreement, was a conflict within the Mataram royal family in Indonesia from 1749 to 1757. The war stemmed from succession disputes following the death of Pakubuwono II, who had ceded much of Java to the Dutch East India Company. His son, Pakubuwono III, supported by the Dutch, faced a challenge from his uncle, Mangkubumi, who allied with Raden Mas Said.1

This conflict ultimately led to the division of Mataram in 1755. Pakubuwono III retained control of Eastern Mataram with Surakarta as its capital, while Mangkubumi became ruler of Western Mataram, establishing his capital in Jogjakarta and later becoming Sultan Amangku Buwono I. Raden Mas Said also received territory in 1757, becoming Mangkunegara I. This period of conflict and division significantly weakened the Javanese kingdom and solidified Dutch influence.12