Raja Lumu did not succeed his father after the latter's death in 1745. Instead, his first cousin, Daeng Kemboja was appointed as the third Yang di-Pertuan Muda of Riau.[1][6] In February 1756, Sulaiman Badrul Alam Shah of Johor, who assumed Selangor is still a part of his territory, offered the Dutch to mine tin ore in Selangor after helping his nephew, Raja Mahmud winning a civil war against his step-brother, Raja Alam.[3] His action was opposed by Daeng Kemboja, Raja Tua of Klang and Raja Lumu.[3] Raja Lumu then sought to strengthen his influence and removed Selangor from Johor empire by seeking recognition from the 16th Sultan of Perak, Sultan Mahmud Shah ibni Sultan Muhammad Shah.[2] He was installed by Sultan Mahmud Shah as the first Sultan of Selangor in November 1766, taking the regnal name, Sultan Salehuddin Shah.[7][8][9][10]