Explanation:

Vishakhadatta was an Indian Sanskrit poet and playwright. Although Vishakhadatta furnishes the names of his father and grandfather as Maharaja Bhaskaradatta and Maharaja Vateshvaradatta in his political drama Mudrarak?asa, we know little else about him.
Varahamihira, also called Varaha or Mihira, was a Hindu polymath who lived in Ujjain. He was born in the Avanti region, roughly corresponding to modern-day Malwa, to Adityadasa, who was himself an astronomer. According to one of his own works, he was educated at Kapitthaka.
Sushruta, or Susruta was an ancient Indian physician known as the main author of the treatise The Compendium of Susruta. The Mahabharata, an ancient Indian epic text, represents him as a son of Vishvamitra, which coincides with the present recension of Sushruta Samhita.
Brahmagupta was an Indian mathematician and astronomer. He is the author of two early works on mathematics and astronomy: the Brahmasphu?asiddhanta, a theoretical treatise, and the Kha??akhadyaka, a more practical text. Brahmagupta was the first to give rules to compute with zero.