Brunei's Civil War - was between, Sultan Abdul Hakkul Mubin and Sultan Muhyiddin. The war took place in Brunei. Sultan Abdul Hakkul Mubin was defeated, his palace was built in Pulau Chermin whilst Sultan Muyhiddin lived in Brunei Town (Now Bandar Seri Begawan). This war took place around the 17th century. More info - wikipedia.org, type Brunei.