Collection Manuscript/Mixed Material Image 1 of Item 20. Letter from Sultan Abdul Rahman ibn Sultan Zainal Abidin the Yang DiPertuan Muda of Terengganu to Colonel William Farquhar. Resident of Singapore. 12 Muharram 1236 (16 October 1820). Item 20. Letter from Sultan Abdul Rahman ibn Sultan Zainal Abidin the Yang DiPertuan Muda of Terengganu to Colonel William Farquhar. Resident of Singapore. 12 Muharram 1236 (16 October 1820).