The Tabaqat-i-Nasiri which was compiled in 1260 CE by the author Minhaj-i-Siraj and it gives a complete account of Muhammad of Ghur’s conquest of India and the history of the Delhi Sultanate up to 1260 CE.
Al Biruni was made court astrologer in Ghazni and he accompanied with Mahmud on his invasions on India. He lived for several years here and is considered to be first Indologist.