According to Khusrau's "Tughluq Nama", Tughluq spent a considerable time searching for a job in Delhi, before he joined the imperial guard of Jalaluddin Khalji. Khusrau states that Tughluq first distinguished himself in the early 1290s, during the Siege of Ranthambore, in which the Khalji forces were led by Ulugh Khan. Khusrau suggests that Tughluq was reduced to obscurity for a brief period after Jalaluddin was killed by his nephew Alauddin Khalji. This probably happened because, unlike many other nobles, Tughluq did not quickly change his loyalty to Alauddin.