Harsha's father, Prabhākara was from Thaneshwar, his brother followed Hinayana Buddhism while, according to Bana, Harsha himself was a Mahayana Buddhist.
According to the Chinese Pilgrim Xuanzang, who visited his kingdom in 636, Harsha built numerous stupas in the name of Buddha. Xuanzang entered a grand competition organized by Harsha and won the theological debate. Harsha also became a patron of art and literature. He made numerous endowments to the University at Nalanda. Two seals of Harsha have been found in Nalanda in the course of the excavations. All these favours and donations of the great emperor were crowned by the construction of a lofty wall enclosing all the buildings of the university to defend the institution from any other possible attack. In 643 he held a Buddhist convocation at Kannauj which was reputedly attended by 20 kings and thousands of pilgrims.
In 641, following Xuanzang's visit, Harsha sent a mission to China which established the first diplomatic relations between China and India. The Chinese responded by sending an embassy consisting of Li Yibiao and Wang Xuanze, who probably traveled through Tibet and whose journey is commemorated in inscriptions at Rajagriha – modern Rajgir, and Bodhgaya.
Harsha was a noted author on his own merit. He wrote three Sanskrit plays – Nagananda, Ratnavali and Priyadarsika. His reign is comparatively well documented, thanks to his court poet Bana and Xuanzang. Bana composed an account of Harsha's rise to power in Harsha Charitha, the first historical poetic work in Sanskrit language. Xuanzang wrote a full description of his travels in India.
info from: http://en.wikipedia.org/wiki/Harsha