Rajyavardhana, also known as Rajya Vardhan, was the king of Thanesar from 605 to 606, and the eldest son of Prabhakarvardhana and member of the Pushyabhuti dynasty.
[3] Prabhakarvardhana had expanded his territory by defeating rulers in Gujarat, Gandhara and Sind, and he had also resisted the invasion of the Huna people.
[2] The marriage alliance of Grahavarman and Rajyashri had strengthened ties between the families to a point that Shashanka, the ruler of the Gauda kingdom in Bengal, found unacceptable.
He retaliated by allying with the Malava kingdom and the forces appear to have launched a successful surprise attack on the Maukhari capital at Kannauj.
He commanded a 10,000-strong cavalry force that was successful in defeating the Malava ruler, with the main army of infantry and war elephants supporting it under the charge of his younger brother, Harsha.