Collection Manuscript/Mixed Material Image 1 of Item 34. Letter from the Yang DiPertuan Muda of Riau to Colonel William Farquhar. Resident of Singapore. 10 Rabiulawal (5 December 1821). Item 34. Letter from the Yang DiPertuan Muda of Riau to Colonel William Farquhar. Resident of Singapore. 10 Rabiulawal (5 December 1821).