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.
The Tughlaq dynasty was a Muslim dynasty of Turko-Indian origin, which ruled over the Delhi sultanate in medieval India. Ghiyasuddin Tughlaq is considered to be the founder of the Tughlaq dynasty.
Khwaja Abu Malik Isami is the author of Futuh-al-Salatin is yet another elaborate account of the Delhi Sultanate. It consists of almost 12,000 verses. The Futuh-us-Salatin is a history of Muslim rule in India until 1349-50.