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We come to know about Harshavardhana from:
Harsha is also known as Harshavardhana, was an Indian emperor who ruled North India from 606 to 647 CE. He was a member of the Vardhana dynasty; and was the son of Prabhakarvardhana who defeated the Alchon Huna invaders, and the younger brother of Rajyavardhana, a king of Thanesar, present-day Haryana.
His biography was written by Banabhatta. We also know about Harshavardhana from Xuan Zang.