Much of the history of the people of the Straits of Malacca in the seventeenth and eighteenth centuries is still unknown and perhaps unknowable, given the lack of source material. However, some aspects of political history are becoming clearer. It has become apparent that this period witnessed a fundamental change in the political structure of the area; able in the past to support empires and cultures of no small renown, the Malay world by the nineteenth century had disintegrated into a mass of petty states, leaderless and disorientated, a power vacuum that the British Empire was eventually forced to fill. Symptoms of this change first became discernable in the early eighteenth century, during the reign of the last Malay Raja Muda of the Johor Empire (1708–18). Johor was then still a powerful force in the Malay world, ruling a widespread area from Siak in Sumatra, through the coastal areas of the Malay peninsula (roughly, in modern terms, from Selangor south, then north again as far as Trengganu), plus the islands of the Riau–Lingga archipelago and Siantan. The sea was still a connecting, rather than a dividing force in Malay politics. In 1708 the administration of this empire fell to Tun Mahmud, who was to be the last Malay to hold the office of Raja Muda in Johor. He was by all accounts a remarkable ruler, under whose guidance Johor attained, for a while, great power and prestige.