Collection Manuscript/Mixed Material Image 1 of Item 15. Letter from Sultan Abdul Rahman ibn Sultan Zainal Abidin the Yang DiPertuan Muda as Acting Sultan of Terengganu to Colonel William Farquhar. Resident of Singapore. 27 Muharram 1235 (15 November 1819). Item 15. Letter from Sultan Abdul Rahman ibn Sultan Zainal Abidin the Yang DiPertuan Muda as Acting Sultan of Terengganu to Colonel William Farquhar. Resident of Singapore. 27 Muharram 1235 (15 November 1819).