# After Prabhakara Vardhana died, his elder son Rajyavardhana ascended to the throne of Thanesar. # Harsha had a sister, Rajyashri who was married to king Grahavarman of Kannauj. Sasanka, the Gauda king killed Grahavarman and kept Rajyashri prisoner. This prompted Rajyavardhana to fight against Sasanka. But Sasanka killed Rajyavardhana. # This led the 16-year old Harshavardhana to ascend the throne of Thanesar in 606 AD. # He vowed to avenge his brother’s murder and also rescue his sister. # For this, he forged an alliance with Bhaskaravarman, the Kamarupa king. Harsha and Bhaskaravarman marched against Sasanka. Ultimately, Sasanka left for Bengal and Harsha became the king of Kannauj also.