Collection Manuscript/Mixed Material Image 1 of Item 6. 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. 1 Zulhijjah 1234 (21 September 1819). Item 6. 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. 1 Zulhijjah 1234 (21 September 1819).