Abdul Hakkul Mubin

Abdul Hakkul Mubin ibni Muhammad Panjang (died c. 1673), posthumously known as Al-Marhum di Pulau, was the Sultan of Brunei from 1661 to 1673.

[5] In contrast to the Pengiran Bendahara Muhyiddin, Sultan Abdul Hakkul Mubin moved the administrative center from Kota Batu to Pulau Chermin.

[11][12] The relocation was carried out under the direction of the recently appointed Pengiran Bendahara Muhyiddin, with the intention that Abdul Hakkul Mubin would stay put to weather the crisis that existed prior to the Brunei Civil War.

[13] After relocating to the island, Muhyiddin established his rule around Kampong Ayer and proclaimed himself the 15th Sultan of Brunei, igniting the nation's first civil war.

[5] Sultan Hakkul Abdul Mubin constructed a fort 10 miles (16 km) from Kota Kinabalu while he retreated to Kinarut, after he was unable to regain control of Kampong Ayer.

[5] When Sultan Muhyiddin's forces lost a battle, the conflict moved back into Brunei, and Abdul Hakkul Mubin relocated to Pulau Chermin.

He was married to Paduka Sri Raja Istri Pangiran Siti Nur Alam, the eldest daughter of the previous mentioned Sultan, and together they had 4 children, whom were:

Pulau Chermin , an islet at the mouth of the Brunei River