Explanation:

- Banabhatta: A celebrated Sanskrit scholar and poet in ancient India, known for writing the biographies of Harshavardhana and works like "Kadambari."

- Visakhadatta: An ancient Indian playwright and dramatist, known for works like "Mudrarakshasa," a historical play concerning the Mauryan empire.

- Harisena: Known for composing the Allahabad Pillar Inscription (Prayag Prashasti), a eulogy for the Gupta Emperor Samudragupta, emphasizing his achievements particularly in the military domain.

- Charaka: A renowned figure in ancient Indian medicine. He is believed to have been one of the principal contributors to the ancient Indian science of Ayurveda and is credited with authoring the "Charaka Samhita," a foundational text in this field.