The last native monarch, prior to the Mahommedan conquest, to establish and maintain paramount power in the north was Harsha, or Harshavardhana (also known as Siladitya), for whose reign (606-648) full and trustworthy materials exist in the book of travels written by the Chinese pilgrim Hsüan Tsang and the _Harsha-charita_ (Deeds of Harsha) composed by Bana, a Brahman who lived at the royal court. Harsha was the younger son of the raja of Thanesar, and gained his first experience of campaigning while still a boy in the successful wars waged by his father and brother against the Huns on the north-western frontier. After the treacherous murder of his brother by Sasanka, king of Central Bengal, he was confirmed as raja, though still very young, by the nobles of Thanesar in 606, though it would appear that his effective rule did not begin till six years later.[9] His first care was to revenge his brother's death, and though it seems that Sasanka escaped destruction for a while (he was still ruling in 619), Harsha's experience of warfare encouraged him to make preparations for bringing all India under his sway. By the end of five and a half years he had actually conquered the north-western regions and also, probably, part of Bengal. After this he reigned for 34½ years, devoting most of his energy to perfecting the administration of his vast dominions, which he did with such wisdom and liberality as to earn the commendation of Hsüan Tsang. In his campaigns he was almost uniformly successful; but in his attempt to conquer the Deccan he was repulsed (620) by the Chalukya king, Pulikesin II., who successfully prevented him from forcing the passes of the Nerbudda. Towards the end of his reign Harsha's empire embraced the whole basin of the Ganges from the Himalayas to the Nerbudda, including Nepal,[10] besides Malwa, Gujarat and Surashtra (Kathiawar); while even Assam (Kamarupa) was tributary to him. The empire, however, died with its founder. His benevolent despotism had healed the wounds inflicted by the barbarian invaders, and given to his subjects a false feeling of security. For he left no heir to carry on his work; his death "loosened the bonds which restrained the disruptive forces always ready to operate in India, and allowed them to produce their normal result, a medley of petty states, with ever-varying boundaries, and engaged in unceasing internecine war."[11] The Deccan.