The dominance of the Siak Sultanate towards the eastern coast of Sumatra and the Malay Peninsula was quite significant. They were able to replace the influence of Johor before on the control of the trade route in the Strait of Malacca. In addition, the Siak Sultanate also emerged as a key holder of the Minangkabau highland, through three main rivers, namely Siak, Kampar, and Kuantan, which had previously been the key to the glory of Malacca. However, the progress of Siak's economy faded along with the emergence of turmoil in the Minangkabau interior known as the Padri War.