Ibrahim Ali Omar Shah

His father, Sultan Muhammad Hassan, was Brunei's ninth Sultan from 1582 to 1598. At his death, he was succeeded by his brother, Sultan Abdul Jalilul Akbar.[1]

Sultan Abdul Jalilul Akbar, Pengiran Muda Tengah, also wanted to become Sultan of Brunei by claiming himself the rightful successor on the basis of having been born when his father became the Crown Prince. Sultan Abdul Jalilul Akbar responded by proclaiming Pengiran Muda Tengah as Sultan of Sarawak, as at that time Sarawak was a territory administered by Brunei.

After the proclamation was made, Pengiran Muda Tengah went to Sarawak to prepare for his coronation. He brought with him a few nobles who were his loyal supporters accompanied by over 1,000 warriors.

Upon arriving in Sarawak, Sultan Tengah build a palace in the area which is known as the present day Kuching. He began to consolidate his power, appointing several of his loyal supporters to a high rank in his administration. He also introduced the post of Datu Patinggi, Datu Shahbandar, Datu Amar and Datu Temenggong. Sultan Tengah proclaimed himself Sultan Ibrahim Ali Omar Shah, and was also known as Sultan Abdul Jalil.

Sultan Tengah married Puteri Suria Kesuma, the younger sister of the Sultan of Sukadana, Sultan Muhammad Saifuddin. She gave birth to the princes Radin Sulaiman, Pengiran Badaruddin (later known as Pengiran Bendahara Seri Maharaja) and Pengiran Abdul Wahab (later known as Pengiran Temenggong Jaya Kesuma).

In Matan, Sultan Tengah married the Matan Princess who had the son Pengiran Mangku Negara, who became Sultan of Matan.

• 
  Mausoleum of Sultan Ibrahim Ali Omar Shah in Santubong, Sarawak.

Sultan Tengah was killed at Batu Buaya in 1641 by one of his followers.[2] He was buried in Kampong Batu Buaya. With his death, the Sultanate of Sarawak came to an end and later consolidated into Brunei once more.