Established in the 18th century during the authority of Abdul Jalil Alamuddin Syah Sultan and Muhammad All Abdul Jalil Alamuddin Syah Sultan of Siak sultanate, the Great Mosque of this kingdom is the oldest mosque in Pekanbaru City. There are the tombs of both Sultans in the yard of the mosque, who are not other than the founders of Pekanbaru City. Other than that, there is also an old well considered holy and frequently visited by visitors, mainly those who possessed the cultural link with Siak Sultanate, while requesting for blessing and fortune.