Brunei Civil War

Brunei Civil War Perang Saudara Brunei Digmaang Sibil sa Brunay
The eastern part of Sabah was given to the Sulu Sultanate by Brunei as a reward for helping Sultan Muhyiddin's forces.
Date 1660 to 1673 Location Brunei Sabah (under Brunei) Result Victory for Muhyiddin: Eastern part of Sabah given to Sulu Sultanate as the reward for assisting the Muhyiddin's Forces. Abdul Hakkul Mubin was killed.
Belligerents
Sultan Abdul Hakkul Mubin's Forces	Sultan Muhyiddin's Forces Rebels from Sultan Muhammad Ali's followers (against Abdul Hakkul Mubin) Sulu Forces
Commanders and leaders
Abdul Hakkul Mubin	Muhyiddin

Victory for Muhyiddin:

Sultan Muhyiddin's Forces

The Brunei Civil War was a civil war fought in Brunei from 1660 to 1673.

During the reign of the thirteenth Sultan Muhammad Ali, there was a disagreement between the son of the Sultan, Pengiran Muda ("prince") Bongsu and Pengiran Muda Alam, the son of Pengiran Abdul Mubin over the results of a cockfight which Pengiran Muda Bungsu lost. His defeat was jeered by Pengiran Muda Alam. In his rage, Bongsu killed Pengiran Muda Alam and escaped from the scene.

In revenge, Abdul Mubin and his followers garroted Sultan Muhammad Ali. Abdul Mubin then made himself the fourteenth Sultan and took the title of "Sultan Hakkul Abdul Mubin". He tried to appease the previous Sultan's followers by appointing Muhammad Ali's grandson, Muhyiddin as the new Bendahara ("Chief Minister").

After a while, however, Muhammad Ali's supporters took revenge by convincing Bendahara Muhyiddin to stand up against Abdul Mubin. Bendahara Muhyddin initially refused, but then later agreed to do so. His supporters started making disturbances in the form of poking spears into palaces and homes. Sultan Abdul Hakkul Mubin then moved his palace to Pulau Chermin under the advice of Muhyiddin with the intent to wait the crisis out.

After he left, however, Muhyiddin declared himself the fifteenth sultan. A battle between the two competing Sultans then ensued. Thus, the civil war of Brunei started.

During the Civil War, Abdul Mubin fled to Kinarut, Malaysia where, he stayed there for ten years, repelling repeated attacks by Sultan Muhyiddin. They returned to Brunei after a final attack by Muhyiddin's forces in which they failed to defeat Abdul Mubin.

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Wikipedia