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.
Abu Rayhan Beruni or Alberonius (Latin) was a Persian Scholar and polymath of the 11th century. He accompanied Mahmud Ghazani in his conquests to South Asia.Al Beruni was the First Muslim Scholar to study India and its Brahmanical tradition. He is called father of Indology and the first anthropologist. He is called one of the earliest and greatest polymath of the Islamic World.
Under the rule of the Vijayanagar empire, irrigation became prominent. The development of irrigation took place mainly during the rule of Deva Raya I. New tanks were built and dams were constructed across the river Tungabhadra.