Abdul Momin was the sultan

Sultan

Sultan is a title with several historical meanings. Originally, it was an Arabic language abstract noun meaning "strength", "authority", "rulership", and "dictatorship", derived from the masdar سلطة , meaning "authority" or "power". Later, it came to be used as the title of certain rulers who...

 of Brunei

Brunei

Brunei , officially the State of Brunei Darussalam or the Nation of Brunei, the Abode of Peace , is a sovereign state located on the north coast of the island of Borneo, in Southeast Asia...

 from 1852 until his death. He was the son of a nobleman named Pengiran Shahbandar Pengiran Anak Abdul Wahab. Pengiran Anak Abdul Momin succeeded his father in law Omar Ali Saifuddin II

Omar Ali Saifuddin II

Pengiran Muda Omar Ali Saifuddin was the son of Sultan Muhammad Jamalul Alam I and Raja Isteri Nor Alam. When his father died in 1804, he was still a minor. Therefore, his grandfather, Paduka Seri Begawan Muhammad Tajuddin ascended the throne for the second time...

 as sultan upon the latter's death, having previously served as regent for him during his ill health. His Highness was well respected as he brought peace and order to the country. During His Highness's reign, the teaching of Islam were encourage and he also sent some Ulama to Holy City of Mekah.

Abdul Momin married Raja Isteri Pengiran Anak Zubaidah binti Almarhum Sultan Omar Ali Saifuddin II, thus making him the latter's son in law.