He became an Imam (Islamic religious leader). as part of his
Fard. When he was 32, he finished translation into Burmese and named the
Islamic book in Three Chapters which he emphasized Islamic belief and basic concepts that Muslims should accept. When he was 50, he wrote
Islamic book in Six Chapters. In 1814, he wrote
Analysis of Philosophy (Panyat Khwetan) in 16 paragram poem. which addressed various topics in Islam. The
35 Chapters book was later published in 1929 and reprinted in 1931 under the title
Guardian of the Burmese-Muslim Race Oopanisha scripture. The slogan, “If the wrongs prevail, the Rightful path will disappear” was published in Burmese and Arabic. He later wrote
Disciplinary teachings in Seven Paragraph Poems as an appendix to the
35 Chapters Book. He wrote ”Royal Report Book” in response to Bowdapaya's query about the various religions, including Islam. He also wrote the Golden book on
Miraj (المعراج) (the Ascension to the Seven Heavens during the Night Journey). On 30 November 1805, Nu went to Bengal for trading. He exported Areca nut or Betel nut through Hantharwaddy port of lower Burma and four towns in Arakan. Later he went to Arakan directly from Ava and based on that trip he wrote a poem with 55 Para. On 12 February 1807,
Bodawpaya sent him to Bengal to retrieve religious, medical and other books. Nu was accompanied by
Mindon and Shew Taung Thiri Sith U Myae. The diplomatic group brought back various books, scriptures and presents from King Thargara and King Bayanathi. After the trip, Nu was appointed the Mayor of
Yammar Wati (now Ramree Island) with the title Shwe Taung Thargathu, which means "Hero of the Ocean". On 12 October 1808, Bodawpaya sent Nu to India to draw the map of the surrounding area, and to bring back more Buddhist Scriptures. Nu's expedition team included Indians who had come to Ava. After traveling to places all over India, the expedition returned to
Sagaing on 18 May 1810, with books, scriptures, various memorabilia and presents. Nu and the team were also sent as spies disguised as the persons searching for the books and scriptures. They also built a rapport with some of the city-state kings in India, some of them sent some presents and requested the Burmese Army's help to repel the British. U Nu was sent again as a spy to India by
Bagyidaw who succeeded
Bodawpaya. King
Bodawpaya recognized him as a poet and also appointed him as the Royal Customs Officer and Royal Purchasing Officer. He had informed the Majesty about the Colonial British and their methods to colonize a country, behaviour, customs, etc. 80 years before
Thibaw Min was overthrown and exiled to
Ratnagiri,
India. With the help of Nu's Bengal information, Bodawpaya was able to capture the western kingdom of
Rakhine, which had been largely independent since the fall of Bagan, in 1784. Bodawpaya also formally annexed
Manipur, a rebellion-prone protectorate, in 1813. U Nu served King
Bodawpaya in
Amarapura, where he read and wrote articles, poems and books. After Bodawpaya's death in 1819, Nu remained at Amarapura until he died in 1822. He was buried near Taung Thaman In (Lake) at Link Zin Kone in Amarapura. ==Personal life==