The expansion and improvement of formal education and his encouragement of religious education were some of his additional contributions to Brunei Darussalam.
Sultan Ahmad Tajuddin was born on 22 August 1913 at the Palace in Brunei Town.
YTM Pengiran Anak Datin Seri Setia Hjh Siti Saerah (Belabab Basar) 2.
YTM Pengiran Anak Siti Zubaidah (Belabab Tangah) 3.
Sultan Ahmad Tajuddin approved the establishment of the Brunei Volunteer Force and Special Police Force to assist the British stop the Japanese invasion to Brunei.
An estimated 200 Bruneians initially volunteered, but by the time of the invasion few remained and no Allied troops were stationed in Brunei.
In contrast to him, he did not enter formal schooling because of the influence of the royal custom that is still strong at that time, which did not allow him to learn along with the common people despite the fact that the system of modern education was started in Brunei since 1914. Tengku Raihani was crowned as Tengku Ampuan of Brunei on 17 March 1940.
In terms of religious education, since early childhood, he was educated in a variety of knowledge about the religion of Islam. In conjunction with his wedding ceremony, he has ordered a new palace to be built and named 'Istana Mahkota Khairani', where he and his wife lived.
By mid-1945 the Japanese were facing defeat and their forces in Brunei were becoming more violent in their actions toward the populace.
A plan was made to save the Sultan and the royal family from this increased Japanese military violence.
YTM Pengiran Anak Datin Seri Setia Hjh Siti Halimah (Belabab Damit) 4.
YTM Pengiran Anak Puteri Hjh Noorehsani Duli Yang Maha Mulia Sultan Sir Ahmad Tajuddin Akhazul Khairi Waddien ibni Almarhum Sir Sultan Mohammad Jamalul Alam II (commonly referred to as Sultan Ahmad Tajuddin), KBE, CMG (22 August 1913 – 3 June 1950) was the 27th sultan of Brunei from 11 September 1924 until his death.
Sultan Ahmad Tajuddin and the royal family, together with loyal palace officials, were hidden by Kasim bin Tamin the village headman of Tantaya.