Mana Deva I seemed to have reigned from 520 B. E.-549 B.E. (464 A.D.-491 A.D.). His father died when he was a small boy. His mother Rajyabati, because of her love for her son, gave up her idea of being a Satee (Le. the practice of emoluting one self along with one’s demised husband). Finding a boy king on the throne, the Thakuri Chieftain in the eastern province rose in rebellion with a view to becoming independent. Mana Deva,when he heard the news, marched with a huge army towards the east to suppress the rebels. By his superior skill in warfare he defeated the rebels and brought them under his control. He then marched westward, defeated the Mallas on the other side of the Gandak and captured Nabalpur. As a result, Mana Deva’s kingdom extended to the other side of Gandaki on the west and Koshi in the east.
After having returned to the capital trium phantly, he performed many Yajnas and gatve away a lot in charity to the Brahmans. Changu Narayan was worshipped with great pomp and grandeur. He got other temples also built. This evinces his interest in architecture. As he was sincerely devoted to his mother, in almost all the temples he built he has got it written that they were built for the greater accumulation of merit for his mother. Though he was a follower of Vishnu, he was tolerant to other, religions. Buddhism also received favourable treatment and impetus under his reign. He got a palatial building named Mangriha built for his residence. Later, it became a centre of administration for the Lichchhavi kings. It is said that it was situated somewhere at Gokarna. He got coins minted in his name and engraved Mananka on them. Trade with India and Tibet also flourished during his reign.
After Mana Deva, his son Mahi Deva became king. His son Basanta Deva succeeded him. After him Udaya Deva, Mana Deva and Gunakama Deva ruled over Nepal successively. Then came Shiva Deva. A man named Amshuvarma was invested with plenipotenciary power for administration. Shiva Deva became a nominal figure-head. In and from 598 A.D. Amshuvarma got coins minted in his own name and himself assumed the title of Maharajadhiraj. He belonged to the Thakuri dynasty. Shiva Deva, seeing his administrative ability and prowess gave him his daughter in marriage. Amshuvarma became the de facto ruler. Shiva Deva got a nine-storeyed palace called Kaliashkut Bhavan built at Gokarna. The beauty of the palace is highly spoken of even by the Chinese pilgrim Huen Tsang. Kailashkut Bhavan became the centre of administration.
Amshuvarma was not only a man of valour but also a shrewd politician, a diplomat and a statesman. With a view not to burden the people with taxation he did away wih all sorts of taxes. He was also a man of letters. Harsha Vardhan in India and Tsrong Tsong Gyampo in Tibet were the contemporaries of Amshuvarma. Both Harsha and Gyampo were engaged in expanding their territories.
The independence of Nepal was in danger, but Amshuvarma by his clever stroke of diplomacy maintained the balance of power and kept his suzerainty intact. He contracted matrimonial alliance with Tibet by giving his daughter Bhrikuti in marriage to Tsrong Tsong Gyampo. Bhrikuti exercised her good offices in spreading Buddhism in Tibet. Because of her efforts, Buddhism took its root in Tibet. Tsrong Tsong Gyampo also married the Chinese princess Wenchang. The Tibetans adored the Nepalese princess as ‘Harita Tara’ and the Chinese princess as ‘Shweta Tara’. The marriage of Tsrong Tsong Gyampo with the Nepalese and Chinese princesses resulted in the opening of the routes from China to India via Nepal.
After the death of Amshuvarma, Udaya Deva II, Shiva Deva’s first son, was driven away and his brother Dhruba ascended the throne. Udaya Deva, thus driven, went to Tibet for help. Though Dhruva Deva was on the throne, Jishnu Gupta was the de facto ruler of Nepal. There was thus dual government in Nepal. Narendra Deva, Udaya Deva’s son, got help from Tsrong Tsong Gyampo of Tibet, defeated Jishnu Gupta and himself ascended the throne.