Namri Songtsen (), also known as "Namri Löntsen" () (died 618) was according to tradition, the 32nd King of Tibet of the Yarlung Dynasty. (Reign: 570 – 618) During his 48 years of reign, he expanded his kingdom to rule the central part of the Tibetan Plateau. He also had a good diplomatic partnership with other tribes and Empires. His actions were decisive in the setting up of the Tibetan Empire (7th century), to which he can be named co-founder with his son, Songtsen Gampo. He Sieged in Kingdom of Sumpa in early 7th century. Dipolamatic Relations The king of southern Tibet, and donated 20,000 households to Namri Songtsen, who gave him the sovereignty of southern Tibet. Context Namri Songtsen was a member of the Yarlung tribe, located to the southeast of Lhasa, in the fertile Yarlung Valley where the Tsangpo (known in India as the Brahmaputra) supported both agriculture and human life. The Tibetan plateau was, at this time, a mosaic of clans of mountain shepherds with simple nomadic organizations where intertribal fighting and razzia sorties were part of the local economy. Each clan had several chiefs. These clans had few material and cultural exchanges due to topography, climate, and distance, so each clan, located in a specified network of valleys, had its own culture with little in common with other clans. These "proto-Tibetans" were isolated from relations with the outside world, though some mountain groups to the east in Sichuan, Qinghai and the 'Azha kingdom dwelt in border areas contiguous with, or within, the Chinese empire. Early Chinese sources appear to mention proto-Tibetan peoples in a few rare cases, if the Qiang and Rong do indeed refer to them. This changed dramatically by the beginning of Tang Dynasty, when the Tibetan kingdom becoming a powerful player in the military history of Eastern and Central Asia. Several Tibetan historical accounts say that it was in Namri Songtsen's time that Tibetans obtained their first knowledge of astrology and medicine from China. Others associate the introduction of these sciences with his son. In the period, knowledge of these and other sciences came from a variety of countries, not only from China, but also from Buddhist India, Byzantium,<ref>Dan Martin, 'Greek and Islamic Medicines' Historical Contact with Tibet: A Reassessment in View of Recently Available but Relatively Early Sources on Tibetan Medical Eclecticism in Anna Akasoy, Charles Burnett, Ronit Yoeli-Tlalim (eds.)Islam and Tibet: