Brunei’ Civil War was fought between Sultan Muhyiddin and Sultan Abdul Hakkul Mubin. It lasted for 12 years from 1661 to 1673.
It started because of misunderstanding over the results of a cockfight between son-in-law of Sultan of Sultan Muhammad Ali, Pengiran Muda Bungsu and the son of Pengiran Bendahara Pengiran Abdul Mubin. Then Pengiran Muda Bungsu killed the son of Pengiran Bendahara Pengiran Abdul Mubin because he lost the game and jeered by the son of Pengiran Bendahara Pengiran Abdul Mubin.
His Father Pengiran Bendahara Pengiran Abdul Mubin became angry. Then he killed Sultan Muhammad Ali and made himself Sultan, known as Sultan Abdul Hakkul Mubin. He appointed Pengiran Muda Bungsu as Bendahara because to avoid anger among the late Sultan’s families. The new Bendahara planned to take revenge on the death of Sultan Muhammad Ali.
Sultan Abdul Mubin became afraid and move to Pulau Chermin. Pengiran Bendahara Pengiran Muda Bungsu made himself Sultan, known as Sultan Muhyiddin. Brunei had two Sultans which led to the outbreak of Brunei’s Civil War. Sultan of Sulu sent his soldiers to support Sultan Muhyiddin to killed Sultan Abdul Hakkul Mubin. Sultan Sulu claim Sabah as a result for helping Sultan Muhyiddin in Civil War.
