Sultanate of Siak Sri Indrapura

The Sultanate of Siak Sri Indrapura, often called Sultanate of Siak (Indonesian: Kesultanan Siak Sri Inderapura; Jawi: كسلطانن سياق سري ايندراڤورا‎), was a kingdom that was located in the Siak Regency, Riau from 1722 to 1949. It was founded by Raja Kechil, who was from the Johor Kingdom (Sultan Abdul Jalil Rahmad Syah I), after he failed to seize the throne of the Sultanate of Johor. The polity expanded in the 18th century to encompass much of eastern Sumatra as it brought various communities under its control through warfare and control of trade between the interior of Sumatra and the Melaka Straits. The Dutch colonial state signed a series of treaties with Siak rulers in the 19th century, which reduced the area of state influence to the Siak River. For the remainder of the Dutch colonial era, it operated as an independent state with Dutch advisors. After Indonesia's Independence was proclaimed on 17 August 1945, the last sultan of Siak (Sultan Syarif Kasim II) declared his kingdom to join the Republic of Indonesia.