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.
The Tiruvengalanatha temple was built at Vijayanagara during the reign of the king Achyuta Deva Raya. Tiruvengalanatha temple is now popularly known as the Achyutaraya temple on the name of this king.
Iitutmish , the Sultan of Delhi, was contemporary of Mongol leader Chengiz Khan. In 1221 A.D., there was a danger of expected attack of Chengiz khan on Delhi.