Collection Manuscript/Mixed Material Image 1 of Item 9. Copy of a letter from the Yang Dipertuan Muda of Riau to Major William Farquhar. Resident of Melaka. 24 Zulkaedah 1233 (25 September 1818). Item 9. Copy of a letter from the Yang Dipertuan Muda of Riau to Major William Farquhar. Resident of Melaka. 24 Zulkaedah 1233 (25 September 1818).